# Opinion polling for the 2020 Republican Party presidential primaries

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vte :
This is a list of nationwide and statewide public opinion polls that have been conducted relating to the Republican primaries for the 2020 United States presidential election. The persons named in the polls are declared candidates or have received media speculation about their possible candidacy. The polls included are among Republicans or Republicans and Republican-leaning independents. If multiple versions of polls are provided, the version among likely voters is prioritized, then registered voters, then adults.

## Background

| Nominee | Exploratory committee | Withdrawn candidate |
| Midterm elections | Iowa caucuses | Super Tuesday | Republican convention |

## National polling

Polling Aggregation :
| Source of poll aggregation | Date updated | Dates polled | Donald Trump | Bill Weld | Joe Walsh | Other and undecided |
| 270 to Win | Feb 19, 2020 | ,Feb 18 – 19, 2020 | 91.0% | 5.0% | - | |
| RealClearPolitics | Feb 11, 2020 | Dec 10, 2019 – Feb 11, 2020 | 89.3% | 4.0% | 3.5% | |
| Average | Average | Average | 90.2% | 4.5% | 3.5% | 1.8% |

### From February 2020

| Poll source | Date(s) administered | Sample size | Margin of error | Rocky De La Fuente | Donald Trump | Bill Weld | Other | Undecided |
| Emerson College | Mar 18–19 | 423 (LV) | – | – | 94% | 6% | – | – |
| | Mar 18 | Weld withdraws from the race | Weld withdraws from the race | Weld withdraws from the race | Weld withdraws from the race | Weld withdraws from the race | Weld withdraws from the race | Weld withdraws from the race |
| | Mar 17 | Florida and Illinois primaries; Trump becomes presumptive nominee | Florida and Illinois primaries; Trump becomes presumptive nominee | Florida and Illinois primaries; Trump becomes presumptive nominee | Florida and Illinois primaries; Trump becomes presumptive nominee | Florida and Illinois primaries; Trump becomes presumptive nominee | Florida and Illinois primaries; Trump becomes presumptive nominee | Florida and Illinois primaries; Trump becomes presumptive nominee |
| | Mar 11 | COVID-19 declared a pandemic by the World Health Organization; national emergency declared Mar 13 | COVID-19 declared a pandemic by the World Health Organization; national emergency declared Mar 13 | COVID-19 declared a pandemic by the World Health Organization; national emergency declared Mar 13 | COVID-19 declared a pandemic by the World Health Organization; national emergency declared Mar 13 | COVID-19 declared a pandemic by the World Health Organization; national emergency declared Mar 13 | COVID-19 declared a pandemic by the World Health Organization; national emergency declared Mar 13 | COVID-19 declared a pandemic by the World Health Organization; national emergency declared Mar 13 |
| | Mar 10 | Idaho, Michigan, Mississippi, Missouri and Washington primaries | Idaho, Michigan, Mississippi, Missouri and Washington primaries | Idaho, Michigan, Mississippi, Missouri and Washington primaries | Idaho, Michigan, Mississippi, Missouri and Washington primaries | Idaho, Michigan, Mississippi, Missouri and Washington primaries | Idaho, Michigan, Mississippi, Missouri and Washington primaries | Idaho, Michigan, Mississippi, Missouri and Washington primaries |
| | Mar 3 | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday | Super Tuesday |
| YouGov/Economist | Mar 1–3 | 232 (LV) | – | 1% | 94% | 2% | 0% | 2% |
| YouGov/Economist | Feb 23–25 | 385 (LV) | – | 1% | 92% | 2% | 1% | 3% |
| YouGov/Economist | Feb 17–18 | 358 (LV) | – | 2% | 91% | 1% | 0% | 5% |
| Emerson College | Feb 16–18 | 482 (LV) | – | – | 91% | 9% | – | – |
| YouGov/Yahoo News | Feb 12–13 | 610 (LV) | – | – | 82% | – | 13% | 4% |
| | Feb 11 | New Hampshire primary | New Hampshire primary | New Hampshire primary | New Hampshire primary | New Hampshire primary | New Hampshire primary | New Hampshire primary |
| YouGov/Economist | Feb 9–11 | 349 (LV) | – | 2% | 90% | 5% | 1% | 2% |
| | Feb 7 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| McLaughlin & Associates | Feb 7–11 | 479 (LV) | – | – | 87% | 6% | 0% | 7% |
| YouGov/Economist | Feb 2–4 | 401 (LV) | – | 0% | 89% | 1% | 3% | 7% |
| | Feb 3 | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses |

### From December 2019 to January 2020

| Poll source | Date(s) administered | Sample size | Margin of error | Rocky De La Fuente | Donald Trump | Joe Walsh | Bill Weld | Other | Undecided |
| YouGov/Economist | Jan 26–28 | 384 (LV) | – | 1% | 89% | 3% | 2% | 1% | 4% |
| Emerson College | Jan 21–23 | 412 (LV) | – | – | 92% | 2% | 6% | – | – |
| YouGov/Economist | Jan 19–21 | 459 (LV) | – | 1% | 89% | 2% | 2% | 2% | 4% |
| YouGov/Economist | Jan 11–14 | 362 (LV) | – | 1% | 88% | 1% | 1% | 1% | 9% |
| YouGov/The Economist | Jan 5–7 | 399 (LV) | – | 1% | 87% | 1% | 2% | 1% | 7% |
| YouGov/The Economist | Dec 28–31 | 359 (LV) | – | 1% | 89% | 1% | 2% | 1% | 6% |
| YouGov/Economist | Dec 22–24 | 415 (LV) | – | 1% | 91% | 2% | 1% | 0% | 5% |
| McLaughlin & Associates | Dec 14–18 | 399 (LV) | – | – | 83% | 2% | 3% | 0% | 11% |
| Emerson College | Dec 15–17 | 492 (LV) | – | – | 90% | 5% | 5% | – | – |
| YouGov/Economist | Dec 14–17 | 354 (LV) | – | 1% | 88% | 2% | 2% | 0% | 7% |
| Suffolk University | Dec 10–14 | 329 (LV) | – | – | 88% | 2% | 2% | 0% | 7% |
| YouGov/Economist | Dec 7–10 | 422 (LV) | – | – | 88% | 2% | 2% | 1% | 8% |
| YouGov/Economist | Dec 1–3 | 417 (LV) | – | – | 89% | 2% | 3% | – | 6% |

### June 2019 to November 2019

| Poll source | Date(s) administered | Sample size | Margin of error | Mark Sanford | Donald Trump | Joe Walsh | Bill Weld | Other | Undecided |
| YouGov/Economist | Nov 24–26 | 402 (LV) | – | – | 89% | 2% | 3% | 1% | 6% |
| RealClear Opinion Research | Nov 15–21 | 780 (LV) | – | – | 89% | 6% | 1% | – | 11% |
| Emerson College | Nov 17–20 | 426 (LV) | – | – | 93% | 4% | 3% | – | – |
| YouGov/Economist | Nov 17–19 | 383 (LV) | – | – | 90% | 2% | 1% | – | 7% |
| | Nov 12 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| YouGov/Economist | Nov 10–12 | 352 (LV) | – | 3% | 89% | 1% | 1% | 1% | 5% |
| YouGov/Economist | Nov 3–5 | 402 (LV) | – | 1% | 87% | 1% | 3% | 1% | 8% |
| YouGov/Economist | Oct 27–29 | 464 (LV) | – | 3% | 83% | 2% | 2% | 1% | 9% |
| Suffolk University/USA Today | Oct 23–26 | 323 (LV) | ± 5.5% | 1% | 85% | 1% | 2% | – | 11% |
| YouGov/Economist | Oct 20–22 | 404 (LV) | – | 3% | 87% | 1% | 1% | 1% | 8% |
| McLaughlin and Associates | Oct 17–22 | 411 | – | 1% | 76% | 1% | 2% | 9% | 12% |
| Emerson College | Oct 18–21 | 378 | ± 4.9% | 3% | 91% | 2% | 5% | – | – |
| Ipsos | Oct 17–18 | 507 | ± 5.7% | 1% | 79% | 1% | 1% | 8% | 11% |
| YouGov/Economist | Oct 10–13 | 354 | – | 2% | 86% | 2% | 3% | – | 5% |
| YouGov/Economist | Oct 6–8 | 473 | ± 2.9% | 1% | 84% | 3% | 3% | – | 8% |
| YouGov/Economist | Sep 28 – Oct 1 | 360 | ± 2.6% | 3% | 86% | 2% | 2% | – | 7% |
| Quinnipiac University | Sep 19–23 | 568 | ± 4.9% | 2% | 80% | 2% | 2% | 1% | 12% |
| Emerson College | Sep 21–23 | 363 | ± 5.1% | 3% | 89% | 5% | 4% | – | – |
| Fox News | Sep 15–17 | 341 | ± 5.0% | 2% | 86% | 2% | 2% | 1% | 5% |
| YouGov/Economist | Sep 14–17 | 416 | ± 2.7% | 2% | 86% | 1% | 5% | 1% | 5% |
| Emerson College | Sep 13–16 | 208 | ± 3.3% | 6% | 86% | 4% | 4% | – | – |
| Public Religion Research Institute | Aug 22 – Sep 15 | 957 | ± 2.8% | – | 74% | – | 10% | 13% | 3% |
| HarrisX | Sep 9–12 | 1,175 | – | 2% | 76% | 2% | 2% | 4% | 14% |
| Democracy Corps | Sep 7–11 | 315 | – | 4% | 85% | 5% | 2% | 1% | 4% |
| YouGov/Economist | Sep 8–10 | 393 | ± 2.7% | 3% | 82% | 1% | 4% | 2% | 7% |
| McLaughlin & Associates | Sep 7–10 | 416 | – | 3% | 76% | 1% | 3% | – | 17% |
| | Sep 8 | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy |
| Emerson College | Aug 24–26 | 482 | ± 2.5% | – | 84% | – | 16% | – | – |
| HarrisX | Aug 23–26 | 1,194 | – | – | 76% | 5% | 3% | 6% | 10% |
| | Aug 25 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
| Suffolk University | Aug 20–25 | 289 | – | – | 90% | – | 5% | – | 5% |
| McLaughlin & Associates | Jul 23–28 | 415 | ± 4.0% | 4% | 81% | – | 2% | – | 14% |
| Democracy Corps | Jul 18–28 | 354 | ± 4.0% | 4% | 89% | – | 4% | – | 3% |
| Emerson College | Jun 21–24 | 407 | ± 4.9% | – | 83% | – | 17% | – | – |
| McLaughlin & Associates | Jun 18–24 | 417 | - | – | 79% | – | 7% | – | 13% |
| Suffolk University/USA Today | Jun 11–15 | 326 | – | – | 90% | – | 5% | – | 5% |

### November 2018 to May 2019

| Poll source | Date(s) administered | Sample size | Margin of error | Jeb Bush | Bob Corker | Ted Cruz | Jamie Dimon | Jeff Flake | Nikki Haley | Larry Hogan | John Kasich | Mike Pence | Mitt Romney | Paul Ryan | Ben Sasse | Donald Trump | Bill Weld | Other | Undecided |
| HarrisX | May 23–25 | 785 | ± 4.0% | – | – | – | – | – | – | – | – | – | – | – | – | 73% | 7% | 5% | 13% |
| Change Research | May 18–21 | 1,248 | ± 2.8% | – | 2% | – | – | – | – | – | – | – | – | – | – | 94% | – | – | 4% |
| Change Research | May 18–21 | 1,248 | ± 2.8% | – | – | – | – | – | 7% | – | – | – | – | – | – | 87% | – | – | 6% |
| Change Research | May 18–21 | 1,248 | ± 2.8% | – | – | – | – | – | – | – | 3% | – | – | – | – | 94% | – | – | 3% |
| | May 16 | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy |
| Emerson College | May 10–13 | 384 | ± 5.0% | – | – | – | – | – | – | – | – | – | – | – | – | 86% | 14% | – | – |
| McLaughlin & Associates | May 7–11 | 330 | – | – | – | – | – | – | – | 1% | 5% | – | – | – | – | 77% | 3% | – | 14% |
| Zogby Analytics | May 2–9 | 463 | – | – | – | – | – | – | – | – | – | – | – | – | – | 81% | 4% | 10% | 6% |
| Quinnipiac University | Apr 26–29 | 419 | ± 5.6% | – | – | – | – | – | – | 3% | – | – | – | – | – | 84% | 3% | 1% | 8% |
| HarrisX | Apr 26–28 | 641 | ± 4.0% | – | – | – | – | – | – | – | – | – | – | – | – | 75% | 7% | 4% | 11% |
| Morning Consult | Apr 19–21 | 641 | ± 4.0% | – | – | – | – | – | – | – | – | – | – | – | – | 78% | 7% | – | 15% |
| Ipsos/Reuters | Apr 18–19 | 344 | ± 5.9% | – | – | – | 1% | 1% | 5% | – | 4% | 10% | – | – | – | 60% | – | 2% | 16% |
| | Apr 15 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| Emerson College | Apr 11–14 | 324 | ± 5.4% | – | – | – | – | – | – | – | – | – | – | – | – | 85% | 15% | – | – |
| Ipsos/Reuters | Mar 25–26 | 362 | ± 5.9% | – | – | – | 1% | 0% | 3% | – | 5% | 8% | – | – | – | 63% | – | 4% | 16% |
| Morning Consult | Mar 22–24 | 638 | ± 4.0% | – | – | – | – | – | – | 9% | – | – | – | – | – | 73% | – | – | 18% |
| Morning Consult | Mar 22–24 | 638 | ± 4.0% | – | – | – | – | – | – | – | 13% | – | – | – | – | 72% | – | – | 16% |
| Morning Consult | Mar 22–24 | 638 | ± 4.0% | – | – | – | – | – | – | – | – | – | – | – | – | 74% | 8% | – | 18% |
| McLaughlin & Associates | Mar 20–24 | 418 | – | – | – | – | – | – | – | – | 5% | – | – | – | – | 80% | 1% | – | 14% |
| Emerson College | Mar 17–18 | 483 | – | – | – | – | – | – | – | – | – | – | – | – | – | 90% | 10% | – | – |
| Ipsos/Reuters | Mar 5–11 | 756 | ± 4.1% | – | 1% | – | 0% | 0% | 3% | – | 3% | – | 9% | – | 0% | 69% | – | 2% | 13% |
| Monmouth University | Mar 1–4 | 339 | ± 5.3% | – | – | – | – | – | – | 6% | – | – | – | – | – | 75% | – | – | 16% |
| Monmouth University | Mar 1–4 | 339 | ± 5.3% | – | – | – | – | – | – | – | – | – | – | – | – | 74% | 8% | – | 18% |
| Ipsos/Reuters | Feb 26 – Mar 4 | 1,086 | ± 3.4% | – | 1% | – | 0% | 1% | 5% | – | 3% | – | 9% | – | 1% | 66% | – | 3% | 13% |
| Ipsos/Reuters | Feb 19–25 | 1,138 | ± 3.3% | – | 0% | – | 1% | 1% | 4% | – | 4% | – | 8% | – | 1% | 65% | – | 3% | 14% |
| Ipsos/Reuters | Feb 12–18 | 1,040 | ± 3.5% | – | 0% | – | 1% | 1% | 3% | – | 4% | – | 8% | – | 1% | 69% | – | 2% | 12% |
| Emerson College | Feb 14–16 | 366 | ± 5.1% | – | – | – | – | – | – | – | – | – | – | – | – | 85% | 15% | – | – |
| FOX News | Feb 10–12 | 432 (A) | ±4.5% | – | – | – | – | – | – | – | – | – | – | – | – | 72% | – | 17% | 11% |
| McLaughlin & Associates | Feb 6–10 | 413 | – | – | – | – | – | – | – | – | 6% | – | 10% | – | – | 72% | – | – | 11% |
| Monmouth University | Jan 25–27 | 335 | ± 5.4% | – | – | 21% | – | – | – | – | – | – | – | – | – | 66% | – | – | 9% |
| Monmouth University | Jan 25–27 | 335 | ± 5.4% | – | – | – | – | – | – | – | 14% | – | – | – | – | 73% | – | – | 11% |
| Zogby Analytics | Jan 18–20 | 307 | ± 5.6% | 2% | – | – | – | 1% | 6% | – | 8% | – | 9% | – | – | 64% | – | 4% | 6% |
| HarrisX | Jan 4–5 | 320 | – | – | – | – | – | – | – | – | – | – | 17% | – | – | 70% | – | – | 13% |
| | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 |
| McLaughlin & Associates | Dec 10–14 | 392 | – | – | – | – | – | 2% | – | – | 5% | – | 9% | – | – | 72% | – | – | 12% |
| Harvard-Harris | Nov 27–28 | 819 | – | 3% | – | 5% | – | 2% | 2% | – | 6% | – | 6% | 5% | 1% | 44% | – | 2% | 16% |
| HarrisX | Nov 16–17 | 320 | – | – | – | 17% | – | – | – | – | – | – | – | – | – | 66% | – | – | 17% |
| HarrisX | Nov 16–17 | 320 | – | – | – | – | – | 9% | – | – | – | – | – | – | – | 70% | – | – | 21% |
| HarrisX | Nov 16–17 | 320 | – | – | – | – | – | – | 13% | – | – | – | – | – | – | 69% | – | – | 18% |
| HarrisX | Nov 16–17 | 320 | – | – | – | – | – | – | – | – | 14% | – | – | – | – | 67% | – | – | 19% |
| HarrisX | Nov 16–17 | 320 | – | – | – | – | – | – | – | – | – | – | 19% | – | – | 69% | – | – | 12% |
| HarrisX | Nov 16–17 | 320 | – | – | – | – | – | – | – | – | – | – | – | 20% | – | 65% | – | – | 15% |
| HarrisX | Nov 16–17 | 320 | – | – | – | – | – | – | – | – | – | – | – | – | 8% | 70% | – | – | 21% |

### Before November 2018

| Poll source | Date(s) administered | Sample size | Margin of error | Bob Corker | Tom Cotton | Ted Cruz | Jeff Flake | Nikki Haley | John Kasich | Mike Pence | Mitt Romney | Marco Rubio | Ben Sasse | Donald Trump | Other | Undecided |
| Harvard-Harris | Jun 24–25 | 430 | – | 15% | – | – | – | – | – | – | – | – | – | 85% | – | – |
| GQR Research | Jan 6–11 | 374 | – | – | – | 4% | 1% | 4% | 3% | 11% | 5% | 5% | – | 62% | 0% | 5% |
| | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 |
| Public Policy Polling | Dec 11–12 | – | – | – | – | 21% | – | – | – | – | – | – | – | 64% | – | 15% |
| Public Policy Polling | Dec 11–12 | – | – | – | – | – | 16% | – | – | – | – | – | – | 74% | – | 10% |
| Public Policy Polling | Dec 11–12 | – | – | – | – | – | – | – | 19% | – | – | – | – | 70% | – | 11% |
| Public Policy Polling | Dec 11–12 | – | – | – | – | – | – | – | – | 22% | – | – | – | 62% | – | 15% |
| Public Policy Polling | Oct 27–29 | – | – | – | – | 27% | – | – | – | – | – | – | – | 57% | – | 16% |
| Public Policy Polling | Oct 27–29 | – | – | – | – | – | 14% | – | – | – | – | – | – | 70% | – | 16% |
| Public Policy Polling | Oct 27–29 | – | – | – | – | – | – | – | 24% | – | – | – | – | 66% | – | 11% |
| Public Policy Polling | Oct 27–29 | – | – | – | – | – | – | – | – | 28% | – | – | – | 53% | – | 19% |
| Public Policy Polling | Sep 22–25 | – | – | – | – | 15% | – | – | – | – | – | – | – | 68% | – | 17% |
| Public Policy Polling | Sep 22–25 | – | – | – | – | – | – | – | 18% | – | – | – | – | 68% | – | 13% |
| Public Policy Polling | Sep 22–25 | – | – | – | – | – | – | – | – | 21% | – | – | – | 59% | – | 21% |
| Fabrizio Lee | Aug 2017 | 1,500 | ± 2.5% | – | 1% | 13% | – | – | 10% | – | – | – | 1% | 54% | – | 20% |
| Public Policy Polling | Aug 18–21 | – | – | – | – | 22% | – | – | – | – | – | – | – | 62% | – | 17% |
| Public Policy Polling | Aug 18–21 | – | – | – | – | – | – | – | 21% | – | – | – | – | 68% | – | 11% |
| Public Policy Polling | Aug 18–21 | – | – | – | – | – | – | – | – | 24% | – | – | – | 52% | – | 23% |
| Opinion Savvy | Aug 16–17 | 220 | ± 6.6% | – | – | 8% | – | – | 17% | – | – | – | – | 68% | – | 7% |
| Opinion Savvy | Aug 16–17 | 221 | ± 6.6% | – | – | 12% | – | – | 15% | 65% | – | – | – | – | – | 8% |
| Marist College | Aug 8–12 | 361 | ± 5.2% | – | – | – | – | – | 23% | – | – | – | – | 64% | – | 10% |
| Marist College | Aug 8–12 | 361 | ± 5.2% | – | – | – | – | – | – | 33% | – | – | – | 56% | – | 8% |

### Against unnamed primary challenger

| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Other | Undecided |
| Rasmussen Reports | May 10–11, 2020 | < 1000 (LV) | – | 70% | 23% | 7% |
| Morning Consult/Politico | Feb 28 - Mar 1 2020 | 718 (LV) | – | 91% | 7% | 2% |
| Morning Consult/Politico | Jan 4–5, 2020 | 700 (RV) | – | 87% | 10% | 3% |
| ABC News/Washington Post | Oct 27–30 | 388 (A) | ±6% | 67% | 30% | 3% |
| FOX News | Oct 27–30 | 388 (A) | ±6% | 78% | 15% | 7% |
| FOX News | Oct 6–8 | 367-376(LV) | ±6% | 77% | 17% | 6% |
| Morning Consult | Jun 29 – Jul 1 | 483 | ± 4.0% | 83% | 15% | 3% |
| Morning Consult | Jun 29 – Jul 1 | 541 | ± 4.0% | 83% | 15% | 2% |
| Morning Consult | Jun 21–24 | 698 | ± 4.0% | 87% | 12% | 1% |
| Morning Consult | Jun 20–23 | 639 | ± 4.0% | 87% | 10% | 3% |
| Morning Consult | Jun 14–16 | 693 | ± 4.0% | 86% | 13% | 2% |
| Morning Consult | Jun 7–9 | 659 | ± 4.0% | 84% | 13% | 3% |
| Morning Consult | May 31 – Jun 2 | 672 | ± 4.0% | 83% | 14% | 3% |
| Change Research | May 18–21 | 1,248 | ± 2.8% | 95% | 4% | – |
| Morning Consult | May 10–12 | 695 | ± 4.0% | 84% | 15% | 3% |
| Morning Consult | May 3–6 | 680 | ± 4.0% | 85% | 13% | 2% |
| Morning Consult | Apr 28–29 | 692 | ± 4.0% | 84% | 13% | 2% |
| Morning Consult | Apr 19–21 | 641 | ± 4.0% | 79% | 18% | 4% |
| Morning Consult | Apr 12–14 | 367 | – | 83% | 15% | 2% |
| Morning Consult | Apr 12–14 | 358 | – | 82% | 15% | 3% |
| Morning Consult | Apr 1–7 | 11,986 | ± 1.0% | 76% | 20% | – |
| Morning Consult | Mar 25–31 | 11,549 | ± 1.0% | 78% | 20% | – |
| Morning Consult | Mar 18–24 | 12,090 | ± 1.0% | 77% | 19% | – |
| Morning Consult | Mar 11–17 | 11,542 | ± 1.0% | 78% | 20% | – |
| Morning Consult | Mar 4–10 | 13,682 | ± 1.0% | 77% | 20% | – |
| Morning Consult | Feb 25 – Mar 3 | 11,154 | ± 1.0% | 77% | 20% | – |
| Morning Consult | Feb 18–24 | 13,782 | ± 1.0% | 77% | 20% | – |
| Morning Consult | Feb 11–17 | 13,974 | ± 1.0% | 77% | 21% | – |
| Morning Consult | Feb 4–10 | 10,685 | ± 1.0% | 77% | 20% | – |
| | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 |
| Public Religion Research Institute | Sep 17 – Oct 1 | 927 | – | 66% | 33% | 1% |
| Saint Leo University | May 25–31 | – | – | 63% | 24% | 13% |
| USC Dornsife/LAT | Dec 15 – Jan 15 | 1,530 | ± 3.0% | 75% | 25% | – |
| Emerson College | Jan 8–11 | 198 | – | 68% | 18% | 14% |
| | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 |
| Public Policy Polling | Dec 11–12 | – | – | 70% | 24% | 6% |
| Public Religion Research Institute | Oct 18–30 | 846 | – | 59% | 34% | 7% |
| Public Policy Polling | Oct 27–29 | – | – | 57% | 36% | 8% |
| Public Policy Polling | Sep 22–25 | – | – | 61% | 27% | 12% |
| Public Policy Polling | Aug 18–21 | – | – | 57% | 29% | 13% |

## Statewide polling

The statewide polls are ordered by the scheduled date of the state's primary or caucus. Polls with a sample size of <100 have their 'sample size' cells marked in red to indicate a lack of reliability.

### Iowa caucus

The Iowa Republican caucus took place on Monday, February 3, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Michael Bloomberg | John Kasich | Donald Trump | Joe Walsh | Bill Weld | Other | Undecided |
| Iowa caucuses (first alignment vote) | Feb 3, 2020 | – | – | – | – | 97.1% | 1.1% | 1.3% | 0.5% | – |
| Emerson College | Oct 13–16, 2019 | 286 | – | – | – | 93% | 2% | 4% | 1% | – |
| | Aug 25 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
| | Apr 15 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| Emerson College | Mar 21–24, 2019 | 207 | ± 6.9% | 8% | – | 93% | – | – | – | – |
| Emerson College | Mar 21–24, 2019 | 207 | ± 6.9% | – | – | 90% | – | 10% | – | – |
| Emerson College | Jan 30 – Feb 2, 2019 | 280 | – | – | 10% | 90% | – | – | – | – |

### New Hampshire primary

The New Hampshire Republican primary took place on Tuesday, February 11, 2020.
Polling Aggregation :
| Source of poll aggregation | Date Updated | Dates polled | Donald Trump | Bill Weld | Joe Walsh | Undecided |
| 270 to Win | Dec 11, 2019 | Nov 26 - Dec 11, 2019 | 79.0% | 11.0% | 3.5% | 6.5% |

#### Since July 2019

| Poll source | Date(s) administered | Sample size | Margin of error | Rocky De La Fuente | Donald Trump | Joe Walsh | Bill Weld | Other | Undecided |
| New Hampshire primary (popular vote) | Feb 11, 2020 | – | – | 0.1% | 84.4% | 0.5% | 9% | 5.9% | – |
| Emerson College | Feb 8–9, 2020 | 500 (LV) | ±4.3% | – | 84% | – | 16% | – | – |
| University of New Hampshire/CNN | Feb 6–9, 2020 | 212 (LV) | ±6.7% | – | 90% | No voters | 7% | 1% | 1% |
| RKM Research and Communications Inc./Boston Herald/FPU/NBC10 | Feb 5–8, 2020 | 440 (LV) | ±4.7% | 3% | 71% | 6% | 8% | 3% | 11% |
| University of New Hampshire/CNN | Feb 5–8, 2020 | 227 (LV) | ±6.5% | – | 91% | No voters | 5% | 2% | 2% |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| University of New Hampshire/CNN | Feb 4–7, 2020 | 203 (LV) | ±6.9% | – | 91% | No voters | 5% | 2% | 3% |
| Marist College/NBC News | Feb 4–6, 2020 | 441 (LV) | ±5.8% | – | 88% | 1% | 7% | 1% | 2% |
| | Feb 3, 2020 | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses | Iowa caucuses |
| RKM Research and Communications Inc./Boston Herald/FPU/NBC10 | Jan 29-Feb 1, 2020 | 438 (LV) | ± 4.7% | 1% | 72% | 3% | 7% | 7% | 10% |
| RKM Research & Communications Inc./Boston Herald/FPU/NBC10 | Jan 23–26, 2020 | 407 (LV) | – | 1% | 72% | 3% | 7% | – | 9% |
| Marist College/NBC News | Jan 20–23, 2020 | 450 (LV) | ± 5.5% | – | 87% | 2% | 8% | 1% | 2% |
| University of New Hampshire/CNN | Jan 16–23, 2020 | 394 (LV) | ± 4.9% | – | 90% | 1% | 4% | 2% | 3% |
| RKM Research and Communications Inc./Boston Herald/FPU/NBC10 | Jan 8–12, 2020 | 402 (LV) | – | 2% | 79% | 4% | 4% | 3% | 3% |
| MassINC Polling Group/WBUR | Dec 3–8, 2019 | 365 (LV) | ± 5.1% | – | 74% | 4% | 9% | 9% | 4% |
| Emerson College | Nov 22–26, 2019 | 440 (LV) | – | – | 84% | 3% | 13% | 0% | – |
| University of New Hampshire/CNN | Oct 21–27, 2019 | 461 (LV) | ± 4.6% | – | 86% | 1% | 5% | 4% | 4% |
| RKM Research and Communications Inc./Boston Herald/FPU | Oct 9–13, 2019 | 405 | ± 4.9% | – | 71% | 5% | 14% | 3% | 7% |
| RKM Research and Communications Inc./Franklin Pierce University/Boston Herald | Sep 4–10, 2019 | 414 | – | – | 88% | 1% | 3% | 1% | 7% |
| Emerson College | Sep 6–9, 2019 | 379 | – | – | 80% | 7% | 13% | – | – |
| | Aug 25, 2019 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
| University of New Hampshire Survey Center/CNN | Jul 8–15, 2019 | 289 (LV) | ± 5.8% | – | 86% | – | 7% | 2% | 5% |
| | May 16, 2019 | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy | De La Fuente announces his candidacy |
| Monmouth University | May 2–7, 2019 | 427 | ± 4.8% | – | 72% | – | 12% | 1% | 2% |

#### Before May 2019

| Poll source | Date(s) administered | Sample size | Margin of error | Tom Cotton | Ted Cruz | Jeff Flake | Larry Hogan | John Kasich | Mike Pence | Mitt Romney | Marco Rubio | Donald Trump | Joe Walsh | Bill Weld | Other | Undecided |
| Suffolk University | Apr 25–28, 2019 | 394 | ± 4.9% | – | – | – | 0% | 9% | – | – | – | 70% | – | 8% | – | 12% |
| Suffolk University | Apr 25–28, 2019 | 394 | ± 4.9% | – | – | – | – | – | – | – | – | 72% | – | 17% | – | 10% |
| University of New Hampshire | Apr 10–18, 2019 | 208 | ± 6.8% | – | – | – | 1% | 10% | – | – | – | 76% | – | 5% | – | 8% |
| | Apr 15 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| University of New Hampshire | Feb 18–26, 2019 | 218 | ± 6.6% | – | – | – | – | 17% | – | – | – | 68% | – | 3% | – | 12% |
| Emerson College | Feb 21–22, 2019 | 328 | ± 5.4% | – | – | – | – | – | – | – | – | 82% | – | 18% | – | – |
| Praecones Analytica | Jan 16–21, 2019 | 330 | – | – | – | – | – | – | – | 24% | – | 70% | – | – | – | 6% |
| Suffolk University | Apr 26–30, 2018 | 315 | ± 5.5% | – | – | 15% | – | – | – | – | – | 72% | – | – | – | 13% |
| Suffolk University | Apr 26–30, 2018 | 315 | ± 5.5% | – | – | – | – | 23% | – | – | – | 68% | – | – | – | 8% |
| Suffolk University | Apr 26–30, 2018 | 315 | ± 5.5% | – | – | – | – | – | – | 28% | – | 63% | – | – | – | 9% |
| Suffolk University | Apr 26–30, 2018 | 315 | ± 5.5% | – | – | – | – | – | – | – | 23% | 66% | – | – | – | 11% |
| University of New Hampshire | Apr 13–22, 2018 | 202 | ± 6.8% | – | – | – | – | 19% | – | – | – | 67% | – | – | 0% | 14% |
| American Research Group | Mar 21–27, 2018 | 420 | ± 5.0% | – | – | 4% | – | 34% | – | – | – | 51% | – | – | – | 11% |
| American Research Group | Mar 21–27, 2018 | 420 | ± 5.0% | – | – | 33% | – | – | – | – | – | 49% | – | – | – | 18% |
| American Research Group | Mar 21–27, 2018 | 420 | ± 5.0% | – | – | – | – | 42% | – | – | – | 48% | – | – | – | 9% |
| American Research Group | Mar 21–27, 2018 | 420 | ± 5.0% | 5% | 7% | 11% | – | 36% | – | – | – | – | – | – | – | 41% |
| American Research Group | Aug 4–6, 2017 | 600 | ± 4.0% | – | – | – | – | 52% | – | – | – | 40% | – | – | – | 8% |
| American Research Group | Aug 4–6, 2017 | 600 | ± 4.0% | – | – | – | – | 52% | 27% | – | – | – | – | – | – | 32% |
Against unnamed primary challenger
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Other | Undecided |
| University of New Hampshire | Apr 10–18, 2019 | 208 | ± 6.8% | 63% | 14% | 23% |
| University of New Hampshire | Feb 18–26, 2019 | 218 | ± 6.6% | 56% | 15% | 29% |
| University of New Hampshire | Aug 2–19, 2018 | 199 | ± 6.9% | 56% | 20% | 24% |
| University of New Hampshire | Apr 13–22, 2018 | 202 | ± 6.8% | 55% | 19% | 27% |
| University of New Hampshire | Jan 28 – Feb 10, 2018 | 157 | ± 7.8% | 60% | 18% | 23% |
| University of New Hampshire | Oct 3–15, 2017 | 191 | ± 7.1% | 47% | 23% | 30% |

### Nevada caucus

The Nevada caucus was cancelled by the Nevada Republican Party in a vote on September 7, 2019.
| Poll source | Date(s) administered | Sample size | Margin of error | Mark Sanford | Donald Trump | Joe Walsh | Bill Weld | Undecided |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| | Nov 12, 2019 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| Emerson College | Oct 31–Nov 3, 2019 | 409 (LV) | – | 2% | 92% | 3% | 3% | – |
| | Sep 8, 2019 | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy |
| | Sep 7, 2019 | The Nevada Republican Party votes to cancel their caucus. | The Nevada Republican Party votes to cancel their caucus. | The Nevada Republican Party votes to cancel their caucus. | The Nevada Republican Party votes to cancel their caucus. | The Nevada Republican Party votes to cancel their caucus. | The Nevada Republican Party votes to cancel their caucus. | The Nevada Republican Party votes to cancel their caucus. |
| | Aug 25, 2019 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
| | Apr 15, 2019 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| Emerson College | Mar 28–30, 2019 | 263 | ± 6.1% | – | 92% | – | 8% | – |

### South Carolina primary

The South Carolina primary was cancelled in a vote by the South Carolina Republican Party on September 7, 2019.
| Poll source | Date(s) administered | Sample size | Margin of error | Bob Corker | Jeff Flake | Nikki Haley | John Kasich | Mark Sanford | Donald Trump | Bill Weld | Undecided |
| | Nov 12 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| | Sep 8 | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy |
| | Sep 7 | The South Carolina Republican Party votes to cancel their primary. | The South Carolina Republican Party votes to cancel their primary. | The South Carolina Republican Party votes to cancel their primary. | The South Carolina Republican Party votes to cancel their primary. | The South Carolina Republican Party votes to cancel their primary. | The South Carolina Republican Party votes to cancel their primary. | The South Carolina Republican Party votes to cancel their primary. | The South Carolina Republican Party votes to cancel their primary. | The South Carolina Republican Party votes to cancel their primary. | The South Carolina Republican Party votes to cancel their primary. |
| Change Research | Aug 9–12, 2019 | 568 (LV) | ± 4.3% | – | – | 14% | – | – | 79% | – | – |
| Change Research | Aug 9–12, 2019 | 568 (LV) | ± 4.3% | – | – | – | – | 2% | 95% | – | – |
| | Apr 15 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| Emerson College | Feb 28 – Mar 2, 2019 | 380 | ± 5.1% | – | – | – | – | | 90% | 10% | – |
| Change Research | Feb 15–18, 2019 | 720 | – | 2% | – | – | – | | 91% | – | 8% |
| Change Research | Feb 15–18, 2019 | 720 | – | – | 2% | – | – | | 93% | – | 5% |
| Change Research | Feb 15–18, 2019 | 720 | – | – | – | 21% | – | | 67% | – | 11% |
| Change Research | Feb 15–18, 2019 | 720 | – | – | – | – | 3% | | 91% | – | 6% |
| Change Research | Feb 15–18, 2019 | 720 | – | – | – | – | – | | 90% | 3% | 7% |
Against unnamed primary challenger
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Other | Undecided |
| Change Research | Jun 11–14, 2019 | 1,183 | ± 2.9% | 95% | 5% | – |

### California primary

The California Republican primary took place on Tuesday, March 3, 2020.
Since June 2019
| Poll source | Date(s) administered | Sample size | Margin of error | Mark Sanford | Donald Trump | Bill Weld | Joe Walsh | Other | Undecided |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| CNN/SSRS | Dec 4–8, 2019 | 298 (LV) | ± 6.7% | – | 85% | 3% | 3% | 2% | 8% |
| | Nov 12, 2019 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| Emerson College | Sep 13–18, 2019 | 208 (LV) | – | 6% | 86% | 4% | – | 4% | - |
| | Sep 8, 2019 | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy |
| | Aug 25, 2019 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
April 2019 to May 2019
| Poll source | Date(s) administered | Sample size | Margin of error | Nikki Haley | John Kasich | Donald Trump | Bill Weld | Undecided |
| Change Research | May 25–28, 2019 | 989 | ± 3.1% | 5% | – | 86% | – | 8% |
| Change Research | May 25–28, 2019 | 989 | ± 3.1% | – | 3% | 90% | – | 7% |
| Change Research | May 25–28, 2019 | 989 | ± 3.1% | – | – | 91% | 3% | 6% |
| | Apr 15, 2019 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| Change Research | Apr 6–9, 2019 | 853 | – | 5% | – | 83% | – | 12% |
| Change Research | Apr 6–9, 2019 | 853 | – | – | 4% | 83% | – | 14% |
Against unnamed primary challenger
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Other | Undecided |
| Change Research | May 25–28, 2019 | 989 | ± 3.1% | 94% | 7% | – |
| Change Research | Apr 6–9, 2019 | 853 | – | 88% | 12% | – |

### Colorado primary

The Colorado Republican primary took place on Tuesday, March 3, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Bill Weld | Undecided |
| Emerson College | Aug 16–19, 2019 | 339 | ± 5.3% | 86% | 14% | – |
| | Apr 15 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
Against unnamed primary challenger
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Other | Undecided |
| Magellan Strategies | Jan 30–31 and Feb 4, 2019 | 622 | ± 3.9% | 78% | 17% | 5% |

### Massachusetts primary

The Massachusetts Republican primary took place on Tuesday, March 3, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Charlie Baker | Jeff Flake | John Kasich | Mike Pence | Mitt Romney | Paul Ryan | Donald Trump | Bill Weld | Other | Undecided |
| MassINC Polling Group/WBUR | Feb 23 - 26, 2020 | 374 (LV) | ± 5.1% | – | – | – | – | – | – | 83% | 14% | 2% | 2% |
| | Apr 15 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| Emerson College | Apr 4–7, 2019 | 183 | ± 7.2% | – | – | – | – | – | – | 82% | 18% | – | – |
| YouGov/UMass Amherst | Nov 7–14, 2018 | 227 | – | 30% | 1% | 3% | – | 7% | 2% | 40% | – | – | 16% |
| YouGov/UMass Amherst | Nov 7–14, 2018 | 225 | – | 33% | 1% | 7% | 26% | 8% | 2% | – | – | – | 22% |

### North Carolina primary

The North Carolina Republican primary took place on Tuesday, March 3, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Joe Walsh | Bill Weld | Other | Undecided |
| High Point University | Feb 21 – 28, 2020 | 246 (LV) | – | 91% | 4% | 3% | – | 2% |
| Marist College | Feb 23 – 27, 2020 | 410 (LV) | ± 5.4% | 93% | – | 6% | <1% | 1% |
| Meredith College | Feb 16 – 24, 2020 | 353 (LV) | – | 85% | 3.1% | 2% | 0.9% | 9.1% |
| SurveyUSA | Feb 13 – 16, 2020 | 501 (LV) | ± 3% | 91% | – | 5% | – | 5% |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| High Point University | Jan 31 – Feb 6, 2020 | 198 (LV) | – | 91% | 4% | 1% | – | 4% |
| | Aug 25, 2019 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
| Emerson College | May 31 – Jun 3, 2019 | 336 | – | 88% | – | 12% | – | – |

### Texas primary

The Texas Republican primary took place on Tuesday, March 3, 2020.
Polling Aggregation :
| Source of poll aggregation | Date Updated | Dates polled | Donald Trump | Mark Sanford | Joe Walsh | Bill Weld | Undecided |
| 270 to Win | Nov 24, 2019 | Nov 18, 2019 | 78.0% | 4.0% | 1.0% | 1.0% | 13.0% |
| Poll source | Date(s) administered | Sample size | Margin of error | Mark Sanford | Donald Trump | Joe Walsh | Bill Weld | Other | Undecided |
| Marist College | Feb 21 - 27, 2020 | 621 (LV) | ±5.1% | – | 94% | – | 4% | <1% | 2% |
| University of Texas at Tyler/DMN | Feb 17 - 26, 2020 | 567 (LV) | ± 4.12% | – | 86% | – | 6% | – | 8% |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| University of Texas at St Tyler/Dallas News | Jan 21–30, 2020 | 445 (LV) | ± 4.65% | – | 88% | 4% | 2% | – | 6% |
| CNN/SSRS | Dec 4–8, 2019 | 537 (LV) | ± 5% | – | 86% | 4% | 3% | 2% | 4% |
| University of Texas at Tyler | Nov 5–14, 2019 | 597 (RV) | - | 4% | 78% | 1% | 1% | – | – |
| | Nov 12, 2019 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| | Sep 8, 2019 | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy |
| | Aug 25, 2019 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
| Emerson College | Aug 1–3, 2019 | 482 | – | – | 90% | – | 10% | – | – |
| Emerson College | Apr 25–28, 2019 | 344 | ± 5.3% | – | 87% | – | 13% | – | – |

### Utah primary

The Utah Republican primary took place in Tuesday, March 3, 2020.
Against unnamed primary challenger
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Other | Undecided |
| Dan Jones & Associates/Salt Lake Chamber of Commerce | October 3–10, 2019 | 600 (LV) | ± 4% | 75% | 22% | – |
| Dan Jones & Associates/Salt Lake Chamber of Commerce | June 11 – July 1, 2019 | 801 (LV) | – | 70% | 28% | – |

### Vermont primary

The Vermont Republican primary took place on Tuesday, March 3, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Rocky De La Fuente | Donald Trump | Bill Weld | Other | Undecided |
| Braun Research/VPR/VT PBS | Feb 4–10, 2020 | 166 (LV) | ± 7.6% | 1% | 85% | 6% | 2% | 7% |

### Wyoming caucuses

The last presidential cycle's Wyoming caucuses took place on March 1 in 2016 and would, if scheduled for Super Tuesday in 2020, take place on March 3, 2020. Instead, the Wyoming Republican state convention was scheduled for May 9, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Mark Sanford | Donald Trump | Joe Walsh | Bill Weld | Undecided |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| | Nov 12, 2019 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| Montana State University Billings | Oct 7–16, 2019 | 67 (LV) | – | No voters | 91% | <1% | <1% | 8% |

### Michigan primary

The Michigan Republican primary took place on Tuesday, March 10, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Mark Sanford | Donald Trump | Joe Walsh | Bill Weld | Undecided |
| YouGov/University of Wisconsin-Madison | Feb 11 – 20, 2020 | 426 (LV) | – | – | 97% | 0% | 1% | 2% |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| | Nov 12, 2019 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| Emerson College | Oct 31–Nov 3, 2019 | | | 2% | 92% | 3% | 3% | - |
| | Sep 8, 2019 | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy |
| | Aug 25, 2019 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
| | Apr 15, 2019 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| Emerson College | Mar 7–10, 2019 | 306 | ± 5.6% | - | 89% | - | 11% | – |

### Illinois primary

The Illinois Republican primary took place on Tuesday, March 17, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Bill Weld | Other | Undecided |
| Southern Illinois University/Paul Simon Public Policy Institute | Feb 10 - 17, 2020 | 232 (LV) | ± 6.4% | 89% | 4% | 2% | 5% |

### Ohio primary

The Ohio Republican primary took place on Tuesday, March 10, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | John Kasich | Mark Sanford | Donald Trump | Joe Walsh | Bill Weld | Undecided |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| | Nov 12, 2019 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| Emerson College | Sep 29–Oct 2, 2019 | 325 (LV) | | - | 2% | 87% | 5% | 5% | - |
| | Sep 8, 2019 | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy |
| | Aug 25, 2019 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
| | Apr 15, 2019 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| Baldwin Wallace University | Feb 28 – Mar 9, 2018 | 261 | ± 6.0% | 27% | - | 62% | - | - | – |

### Florida primary

The Florida Republican primary took place on Tuesday, March 17, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Larry Hogan | John Kasich | Mark Sanford | Donald Trump | Marco Rubio | Joe Walsh | Bill Weld | Undecided |
| FAU-BEPI | Mar 5 – 7, 2020 | 409 (LV) | ± 4.8% | – | – | – | 92.6% | – | – | 3.8% | 3.5% |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| Florida Atlantic University | Jan 9 – 12, 2020 | 488 (LV) | ± 4.4% | – | – | – | 80% | – | 14% | 5% | – |
| | Nov 12, 2019 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| Florida Atlantic University | Sep 12–15, 2019 | 355 | ± 5.2% | – | – | 8% | 85% | – | 5% | 2% | – |
| | Sep 8, 2019 | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy | Sanford announces his candidacy |
| | Aug 25, 2019 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
| Florida Atlantic University | May 16–19, 2019 | 394 | ± 4.9% | 0% | 2% | – | 85% | 5% | – | 1% | 7% |
| | Apr 15, 2019 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
Against unnamed primary challenger
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Other | Undecided |
| Saint Leo University | May 25–31, 2018 | – | – | 68% | 18% | 13% |

### Wisconsin primary

The Wisconsin Republican primary took place on Tuesday, April 7, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Bill Weld | Other | Undecided |
| YouGov/University of Wisconsin-Madison | Feb 11 – 20, 2020 | 348 (LV) | – | 93% | 0% | 0% | 7% |
| | Apr 15 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| Emerson College | Mar 15–17, 2019 | 293 | – | 89% | 11% | – | – |

### Arizona primary

The Arizona 2016 Republican primary was held on March 22, 2016, but the 2020 primary was cancelled on September 9, 2019.
| Poll source | Date(s) administered | Sample size | Margin of error | Mark Sanford | Donald Trump | Joe Walsh | Bill Weld | Other | Undecided |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| | Nov 12, 2019 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| Emerson College | Oct 25–28, 2019 | 367 (LV) | – | 5% | 88% | 3% | 4% | – | – |
| | Sep 9, 2019 | The Arizona Republican Party votes to cancel their primary. | The Arizona Republican Party votes to cancel their primary. | The Arizona Republican Party votes to cancel their primary. | The Arizona Republican Party votes to cancel their primary. | The Arizona Republican Party votes to cancel their primary. | The Arizona Republican Party votes to cancel their primary. | The Arizona Republican Party votes to cancel their primary. | The Arizona Republican Party votes to cancel their primary. |

### Delaware primary

The Delaware Republican primary took place on Tuesday, April 28, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | John Kasich | Donald Trump | Undecided |
| Gravis Marketing | Jul 24–29, 2018 | 288 | ± 5.8% | 9% | 67% | 25% |

### Maryland primary

The Maryland Republican primary took place on Tuesday, April 28, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Larry Hogan | Donald Trump | Undecided |
| Gonzales Research | Apr 29 – May 4, 2019 | 203 | ± 7.0% | 24% | 68% | 8% |

### Pennsylvania primary

The Pennsylvania Republican primary took place on Tuesday, April 28, 2020.
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Joe Walsh | Bill Weld | Undecided |
| | Mar 18, 2020 | Weld withdraws from the race | Weld withdraws from the race | Weld withdraws from the race | Weld withdraws from the race | Weld withdraws from the race | Weld withdraws from the race |
| YouGov/University of Wisconsin-Madison | Feb 11 – 20, 2020 | 462 (LV) | – | 87% | 2% | 2% | 8% |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| | Aug 25, 2019 | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy | Walsh announces his candidacy |
| | Apr 15 | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) | Weld announces his candidacy (exploratory committee on Feb 15, 2019) |
| Emerson College | Mar 26–28, 2019 | 311 | ± 5.5% | 90% | – | 10% | – |

### Montana primary

| Poll source | Date(s) administered | Sample size | Margin of error | Mark Sanford | Donald Trump | Joe Walsh | Bill Weld | Undecided |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| | Nov 12, 2019 | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race | Sanford withdraws from the race |
| Montana State University Billings | Oct 7–16, 2019 | 99 (LV) | – | 1% | 88% | No voters | No voters | 11% |

### New Jersey primary

| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Joe Walsh | Bill Weld | Undecided |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| Emerson College | Jan 16–19, 2020 | 197 (LV) | ± 6.9% | 93% | 4% | 4% | – |

### New Mexico primary

| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump | Joe Walsh | Bill Weld | Undecided |
| | Feb 7, 2020 | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race | Walsh withdraws from the race |
| Emerson College | Jan 3–6, 2020 | 322 (LV) | – | 87% | 8% | 5% | – |