# 2020 United States presidential election in Wisconsin

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vte :
The 2020 United States presidential election in Wisconsin was held on Tuesday, November 3, 2020, as part of the 2020 United States presidential election in which all 50 states plus the District of Columbia participated. Wisconsin voters chose electors to represent them in the Electoral College via a popular vote, pitting the Republican Party's nominee, incumbent President Donald Trump, and running mate Vice President Mike Pence against Democratic Party nominee, former Vice President Joe Biden, and his running mate California Senator Kamala Harris. Wisconsin has 10 electoral votes in the Electoral College.
The 2020 Democratic National Convention was scheduled to be held at the Fiserv Forum in Milwaukee, but it was moved to the nearby Wisconsin Center due to the COVID-19 pandemic.
Polls of Wisconsin in the lead-up to election day showed a clear Biden lead, averaging in the high single digits. Prior to election day, most news organizations considered that the state was leaning towards Biden. Wisconsin was ultimately won by Biden by a narrow 0.63% margin over Trump, a far closer margin than expected and the closest margin since 2004. Trump had won the state in 2016 by 0.77% against Hillary Clinton; however, Biden carried the state with a slightly larger margin than Al Gore or John Kerry did in either 2000 or 2004, respectively. Once again, Trump massively outperformed his polling average, which had Biden up 8.4 points in the state, but not enough to win the state. Trump held his own in counties in northern Wisconsin and in the WOW counties.
Biden won the highest vote share for a Democrat in Waukesha County, at 38.8%, since Jimmy Carter in 1976. Trump carried Brown County, which is Republican-leaning but competitive, though Biden won the city of Green Bay and improved on Clinton's margin in the county at large by about 3.7 points. Biden won back Sauk County, a county in the driftless region of southwestern Wisconsin; Biden also flipped Door County, which has voted for the winning candidate in each election since 1980, save for 1992, and 2024.
On November 18, Trump announced that he would request a recount in Milwaukee County and Dane County. On November 29, both counties re-affirmed Biden's victory, giving him a net gain of 87 votes over Trump.
With Ohio, Florida, and Iowa backing the losing candidate for the first time since 1960, 1992, and 2000 respectively, this election established Wisconsin, Michigan, and Pennsylvania as the states with the longest bellwether streak still in effect today. The last time any of them voted against the winning candidate was 2004, when all three voted for losing Democrat John Kerry.
Wisconsin voted 3.8% more Republican than the nation in general. This is the first time since 2004 that Wisconsin did not vote for the same candidate as neighboring Iowa.

## Primary elections
### Effects of the COVID-19 pandemic

Since the outbreak of the COVID-19 pandemic, several states had delayed their scheduled primaries and extended the vote-by-mail period. Concerns were raised by health officials, poll workers, and voters that in-person voting at the height of the pandemic would be unsafe for vulnerable individuals. Democratic Governor Tony Evers initially signed an executive order for all-mail-in election, but the order was rejected by the Republican-controlled Wisconsin Legislature.
On April 2, although U.S. District Judge William M. Conley refused to postpone the election, he extended the deadline for absentee voting to April 13 (ordering clerks not to release any election data before that date). However, on April 6, the Supreme Court of the United States overturned Conley's decision, meaning that all absentee ballots still had to be postmarked by "election day, Tuesday, April 7" even though it was still acceptable for the ballots to be received by the clerks as late as April 13. The Supreme Court of the United States "did not alter the provision in Conley's amended order which prohibits the reporting of results until April 13".
Governor Evers then called a special session of the legislature to postpone in-person voting, but the session ended within minutes without action, forcing the primary to go on as planned. Despite having previously expressed the view that he would violate the law by doing so, on April 6, Evers issued an executive order which, if enforced, would have postponed the April 7 elections until the tentative date of June 9. Republican leaders immediately announced that they would challenge the order in the Wisconsin Supreme Court. The Wisconsin Supreme Court ruled that Evers did not have the authority to postpone the elections, thus meaning that Evers' executive order was nullified, and that the elections would be held as scheduled on April 7. This was appealed to a federal court who sided with the governor, and that was appealed to the US Supreme Court, which on a 5–4 vote, upheld the state court's ruling.
Voting was somewhat chaotic, with people waiting in the rain for hours in some cases in masks and social distancing. However, by the time the election concluded, Milwaukee Election Commissioner Neil Albrecht stated that despite some of the problems, the in-person voting ran smoothly.

### Democratic primary

2020 Wisconsin Democratic presidential primary :
| Candidate | Votes | % | Delegates |
| Joe Biden | 581,463 | 62.86 | 56 |
| Bernie Sanders | 293,441 | 31.72 | 28 |
| Elizabeth Warren (withdrawn) | 14,060 | 1.52 | |
| Michael Bloomberg (withdrawn) | 8,846 | 0.96 | |
| Amy Klobuchar (withdrawn) | 6,079 | 0.66 | |
| Tulsi Gabbard (withdrawn) | 5,565 | 0.60 | |
| Pete Buttigieg (withdrawn) | 4,946 | 0.53 | |
| Andrew Yang (withdrawn) | 3,349 | 0.36 | |
| Tom Steyer (withdrawn) | 836 | 0.09 | |
| John Delaney (withdrawn) | 529 | 0.06 | |
| Michael Bennet (withdrawn) | 475 | 0.05 | |
| Deval Patrick (withdrawn) | 311 | 0.03 | |
| Write-in votes | 1,575 | 0.17 | |
| Uninstructed Delegate | 3,590 | 0.39 | |
| Total | 925,065 | 100% | 84 |

### Republican primary

Incumbent President Donald Trump ran unopposed in the Republican primary, and thus received all of Wisconsin's 52 delegates to the 2020 Republican National Convention.
2020 Wisconsin Republican primary :
| Candidate | Votes | % | Delegates |
| Donald Trump | 616,780 | 97.87% | 52 |
| Adam Nicholas Paul (write-in) | 246 | 0.04% | |
| Uninstructed | 11,246 | 1.78% | |
| Scattering | 1,924 | 0.31% | |
| Total | 630,196 | 100% | 52 |

## General election
### Final predictions

| Source | Ranking |
| The Cook Political Report | Lean D (flip) |
| Inside Elections | Lean D (flip) |
| Sabato's Crystal Ball | Lean D (flip) |
| Politico | Lean D (flip) |
| RCP | Tossup |
| Niskanen | Likely D (flip) |
| CNN | Lean D (flip) |
| The Economist | Likely D (flip) |
| CBS News | Lean D (flip) |
| 270towin | Lean D (flip) |
| ABC News | Lean D (flip) |
| NPR | Lean D (flip) |
| NBC News | Lean D (flip) |
| 538 | Likely D (flip) |

### Polling
#### Aggregate polls

| Source of poll aggregation | Dates administered | Dates updated | Donald Trump Republican | Joe Biden Democratic | Other/ Undecided | Margin |
| 270 to Win | November 1–2, 2020 | November 3, 2020 | 42.8% | 52.0% | 5.2% | Biden +9.2 |
| Real Clear Politics | October 21 – November 1, 2020 | November 3, 2020 | 44.3% | 51.0% | 4.7% | Biden +6.7 |
| FiveThirtyEight | until November 2, 2020 | November 3, 2020 | 43.7% | 52.1% | 4.2% | Biden +8.4 |
| Average | Average | Average | 43.6% | 51.7% | 4.7% | Biden +8.1 |

#### 2020 polls

| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump Republican | Joe Biden Democratic | Jo Jorgensen Libertarian | Howie Hawkins Green | Other | Undecided |
| SurveyMonkey/Axios | Oct 20 – Nov 2 | 2,814 (LV) | ± 2.5% | 44% | 54% | - | - | – | – |
| Research Co. | Oct 31 – Nov 1 | 450 (LV) | ± 4.6% | 45% | 54% | - | - | 1% | 7% |
| Change Research/CNBC | Oct 29 – Nov 1 | 553 (LV) | ± 4.17% | 45% | 53% | 2% | - | – | 0% |
| Civiqs/Daily Kos | Oct 29 – Nov 1 | 789 (LV) | ± 3.6% | 47% | 51% | - | - | 1% | 0% |
| Swayable | Oct 27 – Nov 1 | 253 (LV) | ± 8.2% | 45% | 55% | 1% | - | – | – |
| Ipsos/Reuters | Oct 27 – Nov 1 | 696 (LV) | ± 4.2% | 43% | 53% | 2% | 0% | 2% | – |
| Ipsos/Reuters | Oct 27 – Nov 1 | 696 (LV) | ± 4.2% | 43% | 53% | - | - | 2% | 2% |
| Ipsos/Reuters | Oct 27 – Nov 1 | 696 (LV) | ± 4.2% | 45% | 53% | - | - | 2% | – |
| AtlasIntel | Oct 30–31 | 781 (LV) | ± 3% | 49% | 51% | - | - | – | 1% |
| Susquehanna Polling & Research Inc./Center for American Greatness | Oct 29–31 | 450 (LV) | ± 4.6% | 46% | 49% | - | - | 2% | 1% |
| Morning Consult | Oct 22–31 | 1,002 (LV) | ± 3% | 41% | 54% | - | - | – | – |
| Emerson College | Oct 29–30 | 751 (LV) | ± 3.1% | 45% | 52% | - | - | 2% | – |
| AtlasIntel | Oct 29–30 | 672 (LV) | ± 4% | 50% | 49% | - | - | 2% | – |
| CNN/SSRS | Oct 29–30 | 873 (LV) | ± 3.9% | 44% | 52% | 3% | - | 0% | 2% |
| Siena College/NYT Upshot | Oct 26–30 | 1,253 (LV) | ± 3.2% | 41% | 52% | 2% | - | 1% | 4% |
| Redfield & Wilton Strategies | Oct 26–29 | 800 (LV) | – | 41% | 53% | 2% | - | 1% | 2% |
| SurveyMonkey/Axios | Oct 1–28 | 4,569 (LV) | ± 2.0% | 43% | 55% | - | - | – | – |
| Swayable | Oct 23–26 | 313 (LV) | ± 7.2% | 45% | 54% | 1% | - | – | – |
| Ipsos/Reuters | Oct 20–26 | 664 (LV) | ± 4.3% | 44% | 53% | 2% | 1% | 3% | – |
| Ipsos/Reuters | Oct 20–26 | 664 (LV) | ± 4.3% | 44% | 53% | - | - | 2% | 2% |
| Trafalgar Group | Oct 24–25 | 1,082 (LV) | ± 2.89% | 47% | 47% | 3% | - | 1% | 1% |
| Marquette Law School | Oct 21–25 | 749 (LV) | ± 4.4% | 43% | 48% | 2% | - | 7% | 0% |
| ABC/Washington Post | Oct 20–25 | 809 (LV) | ± 4% | 40% | 57% | 2% | - | 1% | 1% |
| Gravis Marketing | Oct 23 | 677 (LV) | ± 3.8% | 43% | 54% | - | - | – | 3% |
| YouGov/University of Wisconsin-Madison | Oct 13–21 | 647 (LV) | ± 4.07% | 44% | 53% | - | - | 3% | – |
| Fox News | Oct 17–20 | 1,037 (LV) | ± 3% | 44% | 49% | 2% | - | 1% | 4% |
| RMG Research/PoliticalIQ | Oct 14–20 | 800 (LV) | ± 3.5% | 44% | 50% | - | - | 3% | 4% |
| RMG Research/PoliticalIQ | Oct 14–20 | 800 (LV) | ± 3.5% | 42% | 52% | - | - | 3% | 4% |
| RMG Research/PoliticalIQ | Oct 14–20 | 800 (LV) | ± 3.5% | 45% | 48% | - | - | 3% | 4% |
| Morning Consult | Oct 11–20 | 1,038 (LV) | ± 3% | 42% | 54% | - | - | – | – |
| Susquehanna Polling and Research Inc./Center for American Greatness | Oct 16–19 | 500 (LV) | ± 4.3% | 45% | 45% | 5% | - | 3% | 3% |
| Change Research/CNBC | Oct 16–19 | 447 (LV) | – | 44% | 52% | - | - | – | – |
| Latino Decisions/DFER | Oct 14–19 | 400 (LV) | ± 5% | 45% | 50% | - | - | – | 4% |
| Ipsos/Reuters | Oct 13–19 | 663 (LV) | ± 4.3% | 45% | 51% | 2% | 0% | 3% | – |
| Ipsos/Reuters | Oct 13–19 | 663 (LV) | ± 4.3% | 43% | 51% | - | - | 3% | 3% |
| Trafalgar Group | Oct 14–16 | 1,051 (LV) | ± 2.94% | 46% | 48% | 2% | - | 1% | 3% |
| YouGov/CBS | Oct 13–16 | 1,112 (LV) | ± 3.5% | 45% | 50% | - | - | 3% | 2% |
| Trafalgar Group/Restoration PAC | Oct 11–13 | 1,043 (LV) | ± 2.95% | 45% | 47% | 3% | – | 2% | 3% |
| Redfield & Wilton Strategies | Oct 10–13 | 691 (LV) | – | 40% | 53% | 2% | 0% | – | – |
| David Binder Research/Focus on Rural America | Oct 10–13 | 200 (LV) | – | 43% | 53% | - | - | – | – |
| Civiqs/Rust Belt Rising | Oct 8–11 | 560 (LV) | ± 4.4% | 45% | 53% | - | - | 2% | 1% |
| Siena College/NYT Upshot | Oct 8–11 | 789 (LV) | ± 4% | 41% | 51% | 3% | - | 0% | 5% |
| Ipsos/Reuters | Oct 6–11 | 577 (LV) | ± 4.7% | 45% | 51% | 2% | 0% | 1% | – |
| Ipsos/Reuters | Oct 6–11 | 577 (LV) | ± 4.7% | 44% | 51% | - | - | 3% | 2% |
| Morning Consult | Oct 2–11 | 1,067 (LV) | ± 3% | 44% | 51% | - | - | – | – |
| Redfield & Wilton Strategies | Oct 9–10 | 613 (LV) | – | 45% | 49% | 2% | - | – | – |
| Baldwin Wallace University | Sep 30 – Oct 8 | 883 (LV) | ± 3.4% | 43% | 49% | 2% | 0% | 1% | 6% |
| Redfield & Wilton Strategies | Oct 4–7 | 688 (LV) | ± 3.74% | 41% | 51% | 1% | - | 1% | 6% |
| Ipsos/Reuters | Sep 29 – Oct 5 | 601 (LV) | ± 4.6% | 44% | 50% | - | - | 2% | 4% |
| Change Research/CNBC | Oct 2–4 | 442 (LV) | – | 44% | 51% | - | - | – | – |
| Marquette Law School | Sep 30 – Oct 4 | 805 (RV) | – | 41% | 46% | 5% | - | 7% | 2% |
| Marquette Law School | Sep 30 – Oct 4 | 700 (LV) | – | 42% | 47% | 4% | - | 2% | 1% |
| SurveyMonkey/Axios | Sep 1–30 | 3,806 (LV) | – | 44% | 53% | - | - | – | 2% |
| Trafalgar Group/Restoration PAC | Sep 25–28 | 1,084 (LV) | ± 2.89% | 44% | 47% | 3% | - | 2% | 3% |
| Redfield & Wilton Strategies | Sep 23–27 | 663 (LV) | ± 3.81% | 43% | 48% | 2% | - | 0% | 7% |
| Susquehanna Polling & Research Inc./Center for American Greatness | Sep 23–26 | 500 (LV) | ± 4.3% | 46% | 48% | - | - | – | – |
| Trafalgar Group (R) | Sep 22–24 | 1,189 (LV) | ± 2.76% | 45% | 48% | 3% | - | 2% | 3% |
| Marist College/NBC | Sep 20–24 | 727 (LV) | ± 4.6% | 44% | 54% | - | - | 1% | 1% |
| Baldwin Wallace University | Sep 9–22 | 863 (LV) | ± 3.7% | 41% | 50% | 2% | 0% | 1% | 6% |
| YouGov/UW-Madison Elections Research Center/Wisconsin State Journal | Sep 10–21 | 664 (LV) | – | 46% | 50% | - | - | – | – |
| Change Research/CNBC | Sep 18–20 | 571 (LV) | – | 42% | 51% | - | - | – | – |
| Hart Research Associates/Human Rights Campaign | Sep 17–19 | 400 (LV) | ± 4.9% | 44% | 51% | - | - | – | – |
| Redfield & Wilton Strategies | Sep 12–16 | 636 (LV) | ± 3.89% | 41% | 47% | 1% | 1% | 1% | 10% |
| Ipsos/Reuters | Sep 11–16 | 609 (LV) | – | 43% | 48% | - | - | 2% | 6% |
| Morning Consult | Sep 7–16 | 800 (LV) | ± 3.5% | 42% | 51% | - | - | – | – |
| Civiqs/Rust Belt Rising | Sep 11–15 | 549 (RV) | ± 3.9% | 44% | 51% | - | - | 2% | 2% |
| Morning Consult | Sep 6–15 | 800 (LV) | ± 3.5% | 42% | 51% | - | - | – | – |
| CNN/SSRS | Sep 9–13 | 816 (LV) | ± 4.2% | 42% | 52% | 3% | - | 1% | 1% |
| ABC/Washington Post | Sep 8–13 | 605 (LV) | ± 4.5% | 46% | 52% | - | - | 1% | 1% |
| Siena College/NYT Upshot | Sep 8–10 | 760 (LV) | ± 4.7% | 43% | 48% | 2% | 0% | 2% | 6% |
| Emerson College | Sep 6–8 | 823 (LV) | ± 3.4% | 45% | 52% | - | - | 4% | – |
| Benenson Strategy Group/GS Group/AARP | Aug 28 – Sep 8 | 1,200 (LV) | ± 2.8% | 45% | 50% | - | - | 1% | 4% |
| Change Research/CNBC | Sep 4–6 | 501 (LV) | – | 44% | 50% | - | - | 6% | – |
| Morning Consult | Aug 27 – Sep 5 | 763 (LV) | ± 3.5% | 44% | 50% | - | - | – | – |
| YouGov/CBS | Sep 2–4 | 978 (LV) | ± 3.7% | 44% | 50% | - | - | 2% | 4% |
| Redfield & Wilton Strategies | Aug 30 – Sep 4 | 670 (LV) | ± 3.78% | 41% | 50% | 2% | 0% | 0% | 6% |
| Marquette Law School | Aug 30 – Sep 3 | 688 (LV) | – | 44% | 48% | 4% | - | 2% | 2% |
| Pulse Opinion Research/Rasmussen Reports | Sep 1–2 | 1,000 (LV) | ± 3% | 43% | 51% | - | - | 3% | 2% |
| Fox News | Aug 29 – Sep 1 | 801 (LV) | ± 3.5% | 42% | 50% | 2% | – | 1% | 5% |
| Fox News | Aug 29 – Sep 1 | 853 (RV) | ± 3% | 41% | 49% | 2% | – | 2% | 5% |
| SurveyMonkey/Axios | Aug 1–31 | 1,913 (LV) | – | 49% | 48% | - | - | – | 2% |
| Opinium/The Guardian | Aug 21–28 | 700 (LV) | – | 40% | 53% | - | - | 1% | 5% |
| Morning Consult | Aug 17–26 | 797 (LV) | ± 3.5% | 42% | 52% | - | - | – | – |
| Change Research/CNBC | Aug 21–23 | 925 (LV) | – | 44% | 49% | - | - | – | – |
| Trafalgar Group | Aug 14–23 | 1,011 (LV) | ± 2.99% | 46% | 45% | 4% | - | 2% | 3% |
| Hodas & Associates/Restoration PAC | Aug 17–20 | 600 (LV) | – | 44% | 52% | - | - | – | 4% |
| Redfield and Wilton Strategies | Aug 13–17 | 672 (LV) | ± 3.9% | 40% | 49% | 1% | 1% | 2% | 7% |
| Civiqs/Rust Belt Rising | Aug 13–17 | 753 (RV) | – | 45% | 51% | - | - | 2% | 2% |
| Morning Consult | Aug 7–16 | 788 (LV) | ± 3.5% | 43% | 49% | - | - | 2% | 5% |
| Morning Consult | Aug 4–13 | 797 (LV) | ± 3.5% | 43% | 50% | - | - | – | – |
| Change Research/CNBC | Aug 6–9 | 384 (LV) | – | 43% | 47% | - | - | – | – |
| Marquette Law School | Aug 4–9 | 694 (LV) | ± 3.8% | 46% | 50% | - | - | 3% | 1% |
| YouGov/CBS | Aug 4–7 | 994 (LV) | ± 3.8% | 42% | 48% | - | - | 3% | 7% |
| Pulse Opinion Research/Rasmussen Reports/American Greatness PAC | Aug 5–6 | 750 (LV) | – | 43% | 55% | - | - | 1% | 1% |
| YouGov/University of Wisconsin-Madison | Jul 27 – Aug 6 | 734 (RV) | ± 4.9% | 43% | 49% | - | - | 4% | 4% |
| OnMessage Inc./Heritage Action | Aug 2–4 | 400 (LV) | ± 4.7% | 47% | 47% | - | - | – | 6% |
| Morning Consult | Jul 25 – Aug 3 | 797 (LV) | ± 3.5% | 41% | 51% | - | - | – | – |
| David Binder Research | Jul 30–31 | 200 (LV) | – | 42% | 53% | - | - | – | – |
| SurveyMonkey/Axios | Jul 1–31 | 2,173 (LV) | – | 48% | 50% | - | - | – | 2% |
| Hodas & Associates/Restoration PAC | Jul 22–27 | 600 (LV) | – | 38% | 52% | - | - | – | 10% |
| Change Research/CNBC | Jul 24–26 | 392 (LV) | – | 43% | 48% | - | - | – | – |
| Redfield & Wilton Strategies | Jul 19–24 | 742 (LV) | – | 35% | 45% | 2% | 0% | 3% | 15% |
| Morning Consult | Jul 15–24 | 797 (LV) | ± 3.5% | 44% | 49% | - | - | – | – |
| Gravis Marketing | Jul 22 | 796 (RV) | ± 3.5% | 42% | 50% | - | - | – | 7% |
| Global Strategy Group (D) | Jul 11–17 | 600 (V) | ± 4.0% | 42% | 51% | - | - | 2% | 4% |
| Spry Strategies/American Principles Project | Jul 11–16 | 700 (LV) | ± 3.7% | 45% | 46% | - | - | – | 8% |
| Morning Consult | Jul 5–14 | 797 (LV) | ± 3.5% | 41% | 50% | - | - | – | – |
| Change Research/CNBC | Jul 10–12 | 601 (LV) | – | 42% | 48% | - | - | – | – |
| Morning Consult | Jun 25 – Jul 4 | 797 (LV) | ± 3.5% | 44% | 50% | - | - | – | – |
| SurveyMonkey/Axios | Jun 8–30 | 813 (LV) | – | 47% | 51% | - | - | – | 2% |
| Change Research/CNBC | Jun 26–28 | 502 (LV) | – | 43% | 51% | - | - | – | – |
| Trafalgar Group | Jun 25–26 | 1,021 (LV) | ± 3.0% | 46% | 45% | - | - | 8% | 2% |
| Ogden & Fry | Jun 20–24 | 825 (LV) | ± 3.48% | 44% | 45% | - | - | – | 10% |
| Morning Consult | Jun 15–24 | 797 (LV) | ± 3.5% | 44% | 50% | - | - | – | – |
| Redfield & Wilton Strategies | Jun 14–19 | 846 (LV) | ± 3.37% | 36% | 45% | 1% | 1% | 2% | 15% |
| Marquette Law School | Jun 14–18 | 686 (LV) | – | 44% | 52% | - | - | 3% | 1% |
| Hodas & Associates/Hodas & Associates/Restoration PAC (R) | Jun 12–16 | 600 (LV) | ± 4.0% | 39% | 55% | - | - | – | 6% |
| NYT Upshot/Siena College | Jun 8–15 | 655 (RV) | ± 4.3% | 38% | 49% | - | - | 5% | 8% |
| Morning Consult | Jun 5–14 | 797 (LV) | ± 3.5% | 44% | 49% | - | - | – | – |
| Change Research/CNBC | Jun 12–14 | 231 (LV) | – | 44% | 48% | - | - | 5% | – |
| Morning Consult | May 26 – Jun 4 | 797 (LV) | ± 3.5% | 44% | 48% | - | - | – | – |
| Fox News | May 30 – Jun 2 | 801 (RV) | ± 3.5% | 40% | 49% | - | - | 6% | 5% |
| Change Research/CNBC | May 29–31 | 382 (LV) | – | 45% | 45% | - | - | 5% | 6% |
| Morning Consult | May 16–25 | 797 (LV) | ± 3.5% | 44% | 48% | - | - | – | – |
| Morning Consult | May 6–15 | 797 (LV) | ± 3.5% | 42% | 49% | - | - | – | – |
| Redfield & Wilton Strategies | May 10–14 | 875 (LV) | ± 3.3% | 38% | 48% | - | - | 3% | 10% |
| Hodas & Associates/Hodas & Associates/Restoration PAC (R) | May 6–8 | 600 (LV) | ± 3% | 42% | 51% | - | - | – | 8% |
| Marquette Law School | May 3–7 | 650 (LV) | – | 45% | 49% | - | - | 4% | 2% |
| Morning Consult | Apr 26 – May 5 | 797 (LV) | ± 3.5% | 43% | 49% | - | - | – | – |
| Public Policy Polling | Apr 20–21 | 1,415 (RV) | – | 45% | 50% | - | - | – | 4% |
| Ipsos | Apr 15–20 | 645 (RV) | ± 5.0% | 40% | 43% | - | - | – | – |
| Hodas & Associates/Hodas & Associates/Restoration PAC (R) | Apr 13–15 | 600 (RV) | ± 3.0% | 45% | 50% | - | - | – | 4% |
| Hart Research/CAP Action | Apr 6–8 | 303 (RV) | – | 47% | 48% | - | - | 2% | 3% |
| Marquette Law School | Mar 24–29 | 813 (RV) | – | 45% | 48% | - | - | 4% | 3% |
| Baldwin Wallace University Great Lakes | Mar 17–25 | 822 (RV) | ± 3.8% | 45% | 45% | - | - | – | 10% |
| Change Research | Mar 21–23 | 510 (LV) | – | 49% | 45% | - | – | 6% | 6% |
| Hodas & Associates/Hodas & Associates/Restoration PAC (R) | Mar 17–19 | 600 (RV) | – | 49% | 45% | - | - | – | – |
| Public Policy Polling | Mar 10–11 | 1,727 (RV) | – | 45% | 48% | - | - | – | 6% |
| YouGov/Yahoo News | Mar 6–8 | 459 (RV) | – | 42% | 44% | - | - | 6% | 7% |
| Firehouse Strategies/Øptimus | Mar 5–7 | 502 (LV) | ± 4.7% | 45% | 43% | - | - | – | – |
| Marquette Law School | Feb 19–23 | 1,000 (RV) | – | 46% | 46% | - | - | 5% | 3% |
| YouGov | Feb 11–20 | 936 (RV) | ± 4.0% | 43% | 45% | - | - | – | – |
| Quinnipiac University | Feb 12–18 | 823 (RV) | ± 3.4% | 49% | 42% | - | - | 4% | 4% |
| Expedition Strategies/Progressive Policies Institute | Feb 6–18 | 500 (RV) | – | 44% | 42% | - | - | – | 13% |
| Tarrance Group/Wisconsin Manufacturers and Commerce | Jan 14–16 | 500 (LV) | ± 4.5% | 46% | 47% | - | - | – | 6% |
| Marquette Law School | Jan 8–12 | 701 (LV) | – | 47% | 48% | - | - | 4% | 2% |
| Fox News | Jan 5–8 | 1,504 (RV) | ± 2.5% | 41% | 46% | - | - | 8% | 4% |

#### 2019 polls

| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump Republican | Joe Biden Democratic | Other | Undecided |
| Marquette Law School | Dec 3–8 | 652 (LV) | – | 47% | 49% | 2% | 1% |
| Firehouse Strategies/Øptimus | Dec 3–5 | 610 (LV) | ± 4.1% | 48% | 39% | 8% | 5% |
| Marquette Law School | Nov 13–17 | 685 (LV) | – | 48% | 45% | 5% | 2% |
| NYT Upshot/Siena College | Oct 13–26 | 651 (LV) | ± 4.4% | 44% | 46% | – | – |
| Marquette Law School | Oct 13–17 | 657 (LV) | – | 44% | 51% | 3% | 1% |
| Fox News | Sep 29 – Oct 2 | 1,512 (RV) | ± 2.5% | 39% | 48% | 5% | 6% |
| Firehouse Strategies/Øptimus | Sep 7–9 | 534 (LV) | ± 4.0% | 42% | 44% | 14% | – |
| Marquette Law School | Aug 25–29 | 672 (LV) | – | 44% | 51% | 3% | 2% |
| Firehouse Strategies/Øptimus | Jun 11–13 | 535 (LV) | ± 4.3% | 40% | 46% | 14% | – |
| WPA Intelligence | Apr 27–30 | 200 (LV) | ± 6.9% | 46% | 42% | – | 9% |
| Zogby Analytics | Apr 15–18 | 802 (LV) | ± 3.5% | 40% | 50% | – | 11% |
| Firehouse Strategies/Øptimus | Mar 19–21 | 616 (LV) | ± 4.1% | 40% | 53% | 5% | – |
| Emerson College | Mar 15–17 | 775 (RV) | ± 3.5% | 46% | 54% | – | – |

#### Former candidates and hypothetical polling

Former candidates :
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Michael Bloomberg (D) | Other | Undecided |
| Marquette Law School | Feb 19–23, 2020 | 1,000 (RV) | – | 45% | 44% | 5% | 5% |
| Quinnipiac University | Feb 12–18, 2020 | 823 (RV) | ± 3.4% | 49% | 41% | 5% | 5% |
| Expedition Strategies/Progressive Policies Institute | Feb 6–18, 2020 | 500 (RV) | – | 44% | 43% | – | 12% |
| Firehouse Strategies/Øptimus | Dec 3–5, 2019 | 610 (LV) | ± 4.1% | 49% | 37% | 10% | 4% |
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Cory Booker (D) | Other | Undecided |
| Marquette Law School | Dec 3–8, 2019 | 652 (LV) | – | 47% | 45% | 4% | 4% |
| Marquette Law School> | Nov 13–17, 2019 | 685 (LV) | – | 45% | 45% | 5% | 4% |
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Pete Buttigieg (D) | Other | Undecided |
| Marquette Law School | Feb 19–23, 2020 | 1,000 (RV) | – | 45% | 45% | 5% | 5% |
| YouGov | Feb 11–20, 2020 | 936 (RV) | ± 4.0% | 43% | 45% | – | – |
| Quinnipiac University | Feb 12–18, 2020 | 823 (RV) | ± 3.4% | 49% | 41% | 5% | 5% |
| Expedition Strategies/Progressive Policies Institute | Feb 6–18, 2020 | 500 (RV) | – | 43% | 44% | – | 13% |
| Marquette Law School | Jan 8–12, 2020 | 701 (LV) | – | 47% | 45% | 5% | 4% |
| Fox News | Jan 5–8, 2020 | 1,504 (RV) | ± 2.5% | 41% | 42% | 10 | 7% |
| Marquette Law School | Dec 3–8, 2019 | 652 (LV) | – | 47% | 44% | 4% | 4% |
| Firehouse Strategies/Øptimus | Dec 3–5, 2019 | 610 (LV) | ± 4.1% | 49% | 38% | 8% | 5% |
| Marquette Law School | Nov 13–17, 2019 | 685 (LV) | – | 48% | 40% | 7% | 6% |
| Marquette Law School | Oct 13–17, 2019 | 657 (LV) | – | 44% | 46% | 5% | 4% |
| Firehouse Strategies/Øptimus | Jun 11–13, 2019 | 535 (LV) | ± 4.3% | 41% | 39% | 20% | – |
| Zogby Analytics | Apr 15–18, 2019 | 802 (LV) | ± 3.5% | 41% | 44% | – | 16% |
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Kamala Harris (D) | Other | Undecided |
| Marquette Law School | Aug 25–29, 2019 | 672 (LV) | – | 46% | 46% | 5% | 4% |
| Zogby Analytics | Apr 15–18, 2019 | 802 (LV) | ± 3.5% | 42% | 43% | – | 14% |
| Emerson College | Mar 15–17, 2019 | 775 (RV) | ± 3.5% | 50% | 50% | – | – |
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Amy Klobuchar (D) | Other | Undecided |
| Marquette Law School | Feb 19–23, 2020 | 1,000 (RV) | – | 46% | 46% | 4% | 4% |
| YouGov | Feb 11–20, 2020 | 936 (RV) | ± 4.0% | 43% | 44% | – | – |
| Quinnipiac University | Feb 12–18, 2020 | 823 (RV) | ± 3.4% | 50% | 39% | 5% | 6% |
| Marquette Law School | Nov 13–17, 2019 | 685 (LV) | – | 53% | 36% | 6% | 4% |
| Emerson College | Mar 15–17, 2019 | 775 (RV) | ± 3.5% | 50% | 50% | – | – |
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Beto O'Rourke (D) | Other | Undecided |
| Zogby Analytics | Apr 15–18, 2019 | 802 (LV) | ± 3.5% | 41% | 44% | – | 15% |
| Firehouse Strategies/Øptimus | Mar 19–21, 2019 | 616 (LV) | ± 4.1% | 42% | 45% | 9% | – |
| Emerson College | Mar 15–17, 2019 | 775 (RV) | ± 3.5% | 49% | 51% | – | – |
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Bernie Sanders (D) | Other | Undecided |
| Marquette Law School | Mar 24–29, 2020 | 813 (RV) | – | 47% | 45% | 6% | 2% |
| Baldwin Wallace University Great Lakes | Mar 17–25, 2020 | 822 (RV) | ± 3.8% | 46% | 42% | – | 12% |
| Hodas & Associates/Hodas & Associates/Restoration PAC (R) | Mar 17–19, 2020 | 600 (RV) | – | 50% | 43% | – | – |
| Public Policy Polling | Mar 10–11, 2020 | 1,727 (V) | – | 46% | 48% | – | 7% |
| YouGov/Yahoo News | Mar 6–8, 2020 | 459 (RV) | – | 40% | 46% | 9% | 5% |
| Firehouse Strategies/Øptimus | Mar 5–7, 2020 | 502 (LV) | ± 4.7% | 48% | 42% | – | – |
| Marquette Law School | Feb 19–23, 2020 | 1,000 (RV) | – | 46% | 48% | 3% | 3% |
| YouGov | Feb 11–20, 2020 | 936 (RV) | ± 4.0% | 44% | 46% | – | – |
| Quinnipiac University | Feb 12–18, 2020 | 823 (RV) | ± 3.4% | 50% | 43% | 4% | 4% |
| Expedition Strategies/Progressive Policies Institute | Feb 6–18, 2020 | 500 (RV) | – | 46% | 45% | – | 9% |
| Tarrance Group/Wisconsin Manufacturers and Commerce | Jan 14–16, 2020 | 500 (LV) | ± 4.5% | 47% | 47% | – | 7% |
| Marquette Law School | Jan 8–12, 2020 | 701 (LV) | – | 47% | 47% | 3% | 1% |
| Fox News | Jan 5–8, 2020 | 1,504 (RV) | ± 2.5% | 42% | 46% | 8% | 4% |
| Marquette Law School | Dec 3–8, 2019 | 652 (LV) | – | 48% | 46% | 4% | 1% |
| Firehouse Strategies/Øptimus | Dec 3–5, 2019 | 610 (LV) | ± 4.1% | 51% | 38% | 7% | 4% |
| Marquette Law School | Nov 13–17, 2019 | 685 (LV) | – | 49% | 45% | 5% | 1% |
| NYT Upshot/Siena College | Oct 13–26, 2019 | 651 (LV) | ± 4.4% | 46% | 47% | – | – |
| Marquette Law School | Oct 13–17, 2019 | 657 (LV) | – | 45% | 48% | 4% | 2% |
| Fox News | Sep 29 – Oct 2, 2019 | 1,512 (RV) | ± 2.5% | 40% | 45% | 5% | 6% |
| Firehouse Strategies/Øptimus | Sep 7–9, 2019 | 534 (LV) | ± 4.0% | 43% | 49% | 8% | – |
| Marquette Law School | Aug 25–29, 2019 | 672 (LV) | – | 46% | 48% | 4% | 1% |
| Firehouse Strategies/Øptimus | Jun 11–13, 2019 | 535 (LV) | ± 4.3% | 40% | 47% | 13% | – |
| Zogby Analytics | Apr 15–18, 2019 | 802 (LV) | ± 3.5% | 42% | 49% | – | 9% |
| Tulchin Research (D) | Apr 14–18, 2019 | 400 (LV) | ± 4.9% | 42% | 52% | – | – |
| Firehouse Strategies/Øptimus | Mar 19–21, 2019 | 616 (LV) | ± 4.1% | 41% | 48% | 7% | – |
| Emerson College | Mar 15–17, 2019 | 775 (RV) | ± 3.5% | 48% | 52% | – | – |
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Elizabeth Warren (D) | Other | Undecided |
| Marquette Law School | Feb 19–23, 2020 | 1,000 (RV) | – | 47% | 44% | 4% | 4% |
| YouGov | Feb 11–20, 2020 | 936 (RV) | ± 4.0% | 44% | 46% | – | – |
| Quinnipiac University | Feb 12–18, 2020 | 823 (RV) | ± 3.4% | 51% | 41% | 4% | 4% |
| Marquette Law School> | Jan 8–12, 2020 | 701 (LV) | – | 49% | 45% | 5% | 2% |
| Fox News | Jan 5–8, 2020 | 1,504 (RV) | ± 2.5% | 41% | 44% | 9% | 5% |
| Marquette Law School | Dec 3–8, 2019 | 652 (LV) | – | 48% | 46% | 5% | 2% |
| Firehouse Strategies/Øptimus | Dec 3–5, 2019 | 610 (LV) | ± 4.1% | 50% | 37% | 8% | 5% |
| Marquette Law School | Nov 13–17, 2019 | 685 (LV) | – | 50% | 43% | 4% | 2% |
| NYT Upshot/Siena College | Oct 13–26, 2019 | 651 (LV) | ± 4.4% | 47% | 45% | – | – |
| Marquette Law School | Oct 13–17, 2019 | 657 (LV) | – | 45% | 50% | 3% | 1% |
| Fox News | Sep 29 – Oct 2, 2019 | 1,512 (RV) | ± 2.5% | 41% | 45% | 5% | 7% |
| Firehouse Strategies/Øptimus | Sep 7–9, 2019 | 534 (LV) | ± 4.0% | 42% | 43% | 15% | – |
| Marquette Law School | Aug 25–29, 2019 | 672 (LV) | – | 46% | 48% | 4% | 3% |
| Firehouse Strategies/Øptimus | Jun 11–13, 2019 | 535 (LV) | ± 4.3% | 41% | 41% | 18% | – |
| Zogby Analytics | Apr 15–18, 2019 | 802 (LV) | ± 3.5% | 41% | 47% | – | 12% |
| Emerson College | Mar 15–17, 2019 | 775 (RV) | ± 3.5% | 48% | 52% | – | – |
| Zogby Analytics | Aug 17–23, 2017 | 603 (LV) | ± 4.0% | 37% | 48% | – | 15% |
Hypothetical polling :
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Joe Biden (D) | Howard Schultz (I) | Undecided |
| Emerson College | Mar 15–17, 2019 | 775 (RV) | ± 3.5% | 44% | 51% | 4% | – |
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Bernie Sanders (D) | Howard Schultz (I) | Undecided |
| Emerson College | Mar 15–17, 2019 | 775 (RV) | ± 3.5% | 46% | 48% | 5% | – |
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Generic Democrat | Other | Undecided |
| Baldwin Wallace University/Oakland University/Ohio Northern University | Mar 17–25, 2020 | 997 (RV) | ± 3.7% | 46.8% | 50.4% | – | 2.8% |
| Expedition Strategies/Progressive Policies Institute | Feb 6–18, 2020 | 500 (RV) | – | 41% | 49% | – | 11% |
| Baldwin Wallace University/Oakland University/Ohio Northern University | Jan 8–20, 2020 | 1,038 (RV) | ± 3.3% | 36.7% | 51.2% | – | 12% |
| KFF/Cook Political Report | Sep 23 – Oct 15, 2019 | 745 (RV) | ± 4% | 28% | 41% | – | 21% |
| Change Research/Crooked Media | Aug 9–11, 2019 | 1,966 (V) | ± 2.2% | 45% | 46% | 3% | 6% |
| Public Policy Polling (D) | Apr 23–24, 2019 | 762 (V) | ± 3.6% | 44% | 53% | – | 4% |
| Poll source | Date(s) administered | Sample size | Margin of error | Donald Trump (R) | Generic Opponent | Other | Undecided |
| Marquette University | Released Apr 7, 2019 | 800 (RV) | – | 42% | 57% | 0% | 4% |
| Emerson College | Mar 15–17, 2019 | 775 (RV) | ± 3.5% | 45% | 55% | – | – |
| Marquette University | Jan 16–20, 2019 | 800 (RV) | – | 39% | 57% | 0% | 4% |

### Green Party and Kanye West ballot access lawsuits

In August 2020, the bipartisan Wisconsin Elections Commission voted to keep rapper Kanye West, an independent presidential candidate, off of the 2020 general election ballot in a 5–1 decision on the basis that West's application arrived too late—arriving in person seconds after the deadline.
The commission was split along party lines in a 3–3 decision to keep Howie Hawkins, the Green Party presidential candidate off of the 2020 general election ballot. Hawkins gathered 3,623 valid signatures; however, forms with 1,834 signatures had a different address for Hawkins' running mate Angela Walker. The partisan board voted only to certify the 1,789, placing Hawkins/Walker below the 2,000 signatures required to be on the ballot.
Walker subsequently filed a legal petition to be included on the ballot. On September 10, 2020, the Wisconsin Supreme Court ruled that the election officials had to wait to mail absentee ballots until the court decided whether or not to include the Green Party on the ballot. Some municipal election commissions had already mailed out absentee ballots while others were concerned that they would miss the September 17 deadline by which Wisconsin state law required absentee ballots to mailed out to those who requested them. On September 14, 2020, the court ruled that the ballots would remain as-is without Hawkins or West on the ballot stating, "given their delay in asserting their rights, we would be unable to provide meaningful relief without completely upsetting the election."

### Electoral slates

These slates of electors were nominated by each party in order to vote in the Electoral College if their candidates win the state:
| Donald Trump and Mike Pence Republican Party | Joe Biden and Kamala Harris Democratic Party | Jo Jorgensen and Spike Cohen Libertarian Party | Don Blankenship and William Mohr Constitution Party | Brian T. Carroll and Amar Patel American Solidarity Party |
| Carol BrunnerEdward GrabinsBill FeehanRobert SpindellTom SchriebelDarryl CarlsonPam TravisKelly RuhAndrew HittMary Buestrin | Meg AndrietschShelia StubbsRonald MartinMandela BarnesKhary PenebakerMary ArnoldPatty SchachtnerShannon HolseyTony EversBen Wikler | Darek RaesePatrick BairdStephen EckerKristin WalkerJeff JortschBrian DefferdingNathan GallMike HammondKevin LittenDavid Grover | Nigel BrownDan HerroMatthew KloskowskiColin HudsonThomas HarlandAndrew ZuelkeElizabeth LindeeJosh YoungGlenn PetroskiLorraine Decker | Christopher HansenThuy Quyen TranSteven CarlsonStephen BeallPatrick MaloneCharles AdamsFergus McKiernanRiley DrewDavid BoveeMarianne Bovee |

### Results

2020 United States presidential election in Wisconsin :
| Party | Party | Candidate | Votes | % | ±% |
| | Democratic | Joe BidenKamala Harris | 1,630,866 | 49.45 | +3.00 |
| | Republican | Donald J. Trump (incumbent)Michael R. Pence (incumbent) | 1,610,184 | 48.82 | +1.60 |
| | Independent | Jo JorgensenSpike Cohen | 38,491 | 1.17 | −2.41 |
| | Independent | Brian T. CarrollAmar Patel | 5,259 | 0.16 | N/A |
| | Constitution | Don BlankenshipWilliam Mohr | 5,146 | 0.16 | −0.25 |
| | Independent | Howie Hawkins (write-in)Angela Nicole Walker (write-in) | 1,089 | 0.03 | −1.01 |
| | Independent | Kanye West (write-in)Michelle Tidball (write-in) | 411 | 0.01 | N/A |
| | Independent | Gloria La Riva (write-in)Sunil Freeman (write-in) | 110 | 0.00 | N/A |
| | Independent | Mark Charles (write-in)Adrian Wallace (write-in) | 52 | 0.00 | N/A |
| | Independent | Jade Simmons (write-in)Claudeliah Roze (write-in) | 36 | 0.00 | N/A |
| | Independent | Kasey Wells (write-in) | 25 | 0.00 | N/A |
| | Independent | President R19 Boddie (write-in) | 5 | 0.00 | N/A |
| | Write-in | Write-in | 6,367 | 0.19 | −0.57 |
| Total votes | Total votes | Total votes | 3,298,041 | 100% | |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |
Between 2016 and 2020, the number of voters in Milwaukee suburban counties voting for the Democratic presidential candidate increased.

#### By county

| County | Joe Biden Democratic | Joe Biden Democratic | Donald Trump Republican | Donald Trump Republican | Various candidates Other parties | Various candidates Other parties | Margin | Margin | Total votes cast |
| County | # | % | # | % | # | % | # | % | Total votes cast |
| Adams | 4,329 | 36.63% | 7,362 | 62.29% | 127 | 1.08% | −3,033 | −25.66% | 11,818 |
| Ashland | 4,801 | 54.82% | 3,841 | 43.86% | 115 | 1.32% | 960 | 10.96% | 8,757 |
| Barron | 9,194 | 36.27% | 15,803 | 62.35% | 349 | 1.38% | −6,609 | −26.08% | 25,346 |
| Bayfield | 6,147 | 56.50% | 4,617 | 42.44% | 116 | 1.06% | 1,530 | 14.06% | 10,880 |
| Brown | 65,511 | 45.49% | 75,871 | 52.68% | 2,635 | 1.83% | −10,360 | −7.19% | 144,017 |
| Buffalo | 2,860 | 36.59% | 4,834 | 61.85% | 122 | 1.56% | −1,974 | −25.26% | 7,816 |
| Burnett | 3,569 | 35.19% | 6,462 | 63.72% | 110 | 1.09% | −2,893 | −28.53% | 10,141 |
| Calumet | 12,116 | 39.37% | 18,156 | 59.00% | 502 | 1.63% | −6,040 | −19.63% | 30,774 |
| Chippewa | 13,983 | 38.91% | 21,317 | 59.32% | 638 | 1.77% | −7,334 | −20.41% | 35,938 |
| Clark | 4,524 | 30.37% | 10,002 | 67.14% | 372 | 2.49% | −5,478 | −36.77% | 14,898 |
| Columbia | 16,410 | 48.45% | 16,927 | 49.98% | 532 | 1.57% | −517 | −1.53% | 33,869 |
| Crawford | 3,953 | 45.46% | 4,620 | 53.13% | 122 | 1.41% | −667 | −7.67% | 8,695 |
| Dane | 260,121 | 75.46% | 78,794 | 22.86% | 5,813 | 1.68% | 181,327 | 52.60% | 344,728 |
| Dodge | 16,356 | 33.77% | 31,355 | 64.73% | 725 | 1.50% | −14,999 | −30.96% | 48,436 |
| Door | 10,044 | 49.93% | 9,752 | 48.48% | 321 | 1.59% | 292 | 1.45% | 20,117 |
| Douglas | 13,218 | 53.56% | 10,923 | 44.26% | 536 | 2.18% | 2,295 | 9.30% | 24,677 |
| Dunn | 9,897 | 42.07% | 13,173 | 56.00% | 454 | 1.93% | −3,276 | −13.93% | 23,524 |
| Eau Claire | 31,620 | 54.26% | 25,341 | 43.49% | 1,314 | 2.25% | 6,279 | 10.77% | 58,275 |
| Florence | 781 | 26.56% | 2,133 | 72.55% | 26 | 0.89% | −1,352 | −45.99% | 2,940 |
| Fond du Lac | 20,588 | 35.96% | 35,754 | 62.45% | 909 | 1.59% | −15,166 | −26.49% | 57,251 |
| Forest | 1,721 | 34.06% | 3,285 | 65.01% | 47 | 0.93% | −1,564 | −30.95% | 5,053 |
| Grant | 10,998 | 42.95% | 14,142 | 55.22% | 468 | 1.83% | −3,144 | −12.27% | 25,608 |
| Green | 10,851 | 50.69% | 10,169 | 47.51% | 386 | 1.80% | 682 | 3.18% | 21,406 |
| Green Lake | 3,344 | 31.34% | 7,168 | 67.17% | 159 | 1.49% | −3,824 | −35.83% | 10,671 |
| Iowa | 7,828 | 55.95% | 5,909 | 42.23% | 255 | 1.82% | 1,919 | 13.72% | 13,992 |
| Iron | 1,533 | 38.23% | 2,438 | 60.80% | 39 | 0.97% | −905 | −22.57% | 4,010 |
| Jackson | 4,256 | 41.79% | 5,791 | 56.86% | 137 | 1.35% | −1,535 | −15.07% | 10,184 |
| Jefferson | 19,904 | 41.48% | 27,208 | 56.71% | 867 | 1.81% | −7,304 | −15.23% | 47,979 |
| Juneau | 4,746 | 34.62% | 8,749 | 63.82% | 214 | 1.56% | −4,003 | −29.20% | 13,709 |
| Kenosha | 42,193 | 47.55% | 44,972 | 50.68% | 1,573 | 1.77% | −2,779 | −3.13% | 88,738 |
| Kewaunee | 3,976 | 32.87% | 7,927 | 65.54% | 192 | 1.59% | −3,951 | −32.67% | 12,095 |
| La Crosse | 37,846 | 55.75% | 28,684 | 42.25% | 1,354 | 2.00% | 9,162 | 13.50% | 67,884 |
| Lafayette | 3,647 | 42.63% | 4,821 | 56.35% | 87 | 1.02% | −1,174 | −13.72% | 8,555 |
| Langlade | 3,704 | 33.18% | 7,330 | 65.65% | 131 | 1.17% | −3,626 | −32.47% | 11,165 |
| Lincoln | 6,261 | 37.95% | 10,017 | 60.72% | 219 | 1.33% | −3,756 | −22.77% | 16,497 |
| Manitowoc | 16,818 | 37.52% | 27,218 | 60.72% | 793 | 1.76% | −10,400 | −23.20% | 44,829 |
| Marathon | 30,808 | 40.14% | 44,624 | 58.14% | 1,319 | 1.72% | −13,816 | −18.00% | 76,751 |
| Marinette | 7,366 | 32.06% | 15,304 | 66.60% | 309 | 1.34% | −7,938 | −34.54% | 22,979 |
| Marquette | 3,239 | 35.73% | 5,719 | 63.09% | 107 | 1.18% | −2,480 | −27.36% | 9,065 |
| Menominee | 1,303 | 81.95% | 278 | 17.48% | 9 | 0.57% | 1,025 | 64.47% | 1,590 |
| Milwaukee | 317,527 | 69.07% | 134,482 | 29.25% | 7,714 | 1.68% | 183,045 | 39.82% | 459,723 |
| Monroe | 8,433 | 37.30% | 13,775 | 60.92% | 403 | 1.78% | −5,342 | −23.62% | 22,611 |
| Oconto | 6,715 | 28.93% | 16,226 | 69.89% | 274 | 1.18% | −9,511 | −40.96% | 23,215 |
| Oneida | 10,105 | 41.83% | 13,671 | 56.59% | 383 | 1.58% | −3,566 | −14.76% | 24,159 |
| Outagamie | 47,667 | 44.13% | 58,385 | 54.05% | 1,970 | 1.82% | −10,718 | −9.92% | 108,022 |
| Ozaukee | 26,517 | 43.13% | 33,912 | 55.15% | 1,057 | 1.72% | −7,395 | −12.02% | 61,486 |
| Pepin | 1,489 | 35.93% | 2,584 | 62.36% | 71 | 1.71% | −1,095 | −26.43% | 4,144 |
| Pierce | 9,796 | 42.01% | 12,815 | 54.96% | 706 | 3.03% | −3,019 | −12.95% | 23,317 |
| Polk | 9,370 | 35.53% | 16,611 | 62.99% | 390 | 1.48% | −7,241 | −27.46% | 26,371 |
| Portage | 20,428 | 50.31% | 19,299 | 47.53% | 876 | 2.16% | 1,129 | 2.78% | 40,603 |
| Price | 3,032 | 35.48% | 5,394 | 63.12% | 120 | 1.40% | −2,362 | −27.64% | 8,546 |
| Racine | 50,159 | 47.12% | 54,479 | 51.18% | 1,813 | 1.70% | −4,320 | −4.06% | 106,451 |
| Richland | 3,995 | 44.32% | 4,871 | 54.04% | 148 | 1.64% | −876 | −9.72% | 9,014 |
| Rock | 46,658 | 54.66% | 37,138 | 43.51% | 1,564 | 1.83% | 9,520 | 11.15% | 85,360 |
| Rusk | 2,517 | 31.92% | 5,257 | 66.66% | 112 | 1.42% | −2,740 | −34.74% | 7,886 |
| Sauk | 18,108 | 50.02% | 17,493 | 48.32% | 602 | 1.66% | 615 | 1.70% | 36,203 |
| Sawyer | 4,498 | 42.80% | 5,909 | 56.22% | 103 | 0.98% | −1,411 | −13.42% | 10,510 |
| Shawano | 7,131 | 31.53% | 15,173 | 67.09% | 311 | 1.38% | −8,042 | −35.56% | 22,615 |
| Sheboygan | 27,101 | 41.06% | 37,609 | 56.97% | 1,301 | 1.97% | −10,508 | −15.91% | 66,011 |
| St. Croix | 23,190 | 40.89% | 32,199 | 56.78% | 1,318 | 2.33% | −9,009 | −15.89% | 56,707 |
| Taylor | 2,693 | 25.20% | 7,657 | 71.65% | 336 | 3.15% | −4,964 | −46.45% | 10,686 |
| Trempealeau | 6,285 | 40.86% | 8,833 | 57.43% | 262 | 1.71% | −2,548 | −16.57% | 15,380 |
| Vernon | 7,457 | 46.83% | 8,218 | 51.61% | 248 | 1.56% | −761 | −4.78% | 15,923 |
| Vilas | 5,903 | 38.41% | 9,261 | 60.26% | 205 | 1.33% | −3,358 | −21.85% | 15,369 |
| Walworth | 22,789 | 39.56% | 33,851 | 58.77% | 960 | 1.67% | −11,062 | −19.21% | 57,600 |
| Washburn | 3,867 | 37.26% | 6,334 | 61.03% | 177 | 1.71% | −2,467 | −23.77% | 10,378 |
| Washington | 26,650 | 30.26% | 60,237 | 68.40% | 1,183 | 1.34% | −33,587 | −38.14% | 88,070 |
| Waukesha | 103,906 | 38.77% | 159,649 | 59.57% | 4,441 | 1.66% | −55,743 | −20.80% | 267,996 |
| Waupaca | 9,703 | 33.31% | 18,952 | 65.06% | 475 | 1.63% | −9,249 | −31.75% | 29,310 |
| Waushara | 4,388 | 32.34% | 9,016 | 66.45% | 164 | 1.21% | −4,628 | −34.11% | 13,568 |
| Winnebago | 44,060 | 46.86% | 47,796 | 50.83% | 2,176 | 2.31% | −3,736 | −3.97% | 94,032 |
| Wood | 16,365 | 39.63% | 24,308 | 58.86% | 625 | 1.51% | −7,943 | −19.23% | 41,298 |
| Totals | 1,630,866 | 49.45% | 1,610,184 | 48.82% | 56,991 | 1.73% | 20,682 | 0.63% | 3,298,041 |
* Democratic — +7.5–10%
* Democratic — +5–7.5%
* Democratic — +2.5–5%
* Democratic — +0–2.5%
* Republican — +0–2.5%
* Republican — +2.5–5%
* Republican — +5–7.5%
* Democratic — +7.5–10%
* Democratic — +5–7.5%
* Democratic — +2.5–5%
* Democratic — +0–2.5%
* Republican — +0–2.5%
* Republican — +2.5–5%
* Republican — +5–7.5%
* Democratic  Hold  Gain from Republican Republican  Hold
Counties that flipped from Republican to Democratic
* Door (largest municipality: Sturgeon Bay)
* Sauk (largest municipality: Baraboo)

#### By congressional district

Despite narrowly losing, Trump won 6 out of 8 congressional districts in Wisconsin, including one held by a Democrat.
| District | Trump | Biden | Representative |
| 1st | 53.8% | 44.6% | Bryan Steil |
| 2nd | 29.1% | 69.2% | Mark Pocan |
| 3rd | 51.4% | 46.7% | Ron Kind |
| 4th | 22.5% | 75.9% | Gwen Moore |
| 5th | 56.7% | 41.6% | Jim Sensenbrenner |
| 5th | 56.7% | 41.6% | Scott Fitzgerald |
| 6th | 56.7% | 41.5% | Glenn Grothman |
| 7th | 59.1% | 39.2% | Tom Tiffany |
| 8th | 57.1% | 41.2% | Mike Gallagher |

## Analysis

Prior to the 2016 election, Wisconsin was considered part of the blue wall—the group of states that had voted Democratic in every presidential election from at least 1992 on. Wisconsin itself had voted Democratic in every election from 1988 on, having been one of 10 states that supported Michael Dukakis in 1988. Republicans had scored notable statewide victories over the Obama presidency, with Scott Walker having won election and re-election as Governor and having fought off a recall attempt in 2012, and with Ron Johnson having defeated Russ Feingold in the 2010 Senate election. Nevertheless, Wisconsin was seen as a lean-Democratic state given its presidential voting history. Trump pulled off a surprise win in the state in 2016, in large part due to a collapse in support for Hillary Clinton in the state.
In 2020, both Trump and Biden improved their parties' vote shares in Wisconsin. Trump achieved a record for the total number of votes ever received by a Republican presidential nominee in Wisconsin, although he fell short of George W. Bush's 2004 vote share. Biden improved on Hillary Clinton's number of votes received, as he did in every state, but fell short of the number of votes won by Barack Obama in 2008.
Joe Biden received strong support in the city of Milwaukee, improving on Clinton's 2016 performance by 3.6 points in its county; Biden received 92% and 60% of the black and Latino vote respectively, with most of that electorate living in Milwaukee County. Both candidates performed well in the state with whites, with Trump carrying whites overall by 6 points, though Biden performed better with college-educated whites. Cementing Biden's victory was his strong performance in Dane County, which he carried by nearly 53 points. Biden would also carry La Crosse County by 13 points, Eau Claire County by 10 points, and flipped Sauk County and the bellwether Door County, while only losing Brown County by seven points, winning the county seat Green Bay. Biden even made in-roads in Waukesha and Washington counties, nearly breaking 40% in the former and breaking 30% in the latter, though Trump still held these counties with large margins.
On the other hand, Trump was able to hold much of the Driftless region in southwestern Wisconsin; many of these counties, such as Vernon, Crawford, and Grant were reliably Democratic during the latter half of the 20th century, but Trump maintained his results from 2016, solidifying a Republican shift in this part of the state. Additionally, Trump performed strongly in the more traditionally conservative northern counties of Wisconsin. Finally, Trump kept Kenosha County in his column, with both candidates improving there; Kenosha County is significant, as it was the site of the Jacob Blake shooting, which triggered nationwide protests.
Biden became the first Democrat to win the White House without the once-strongly Democratic counties of Kenosha and Forest since Woodrow Wilson in 1916 as well as the first to win without Pepin County since 1944. He was the first Democrat since 1960 to win without Adams, Buffalo, Crawford, Dunn, Jackson, Juneau, Lincoln, Price, Sawyer, and Trempealeau counties; and the first since 1976 to win without Columbia, Grant, Lafayette, Marquette, Racine, Richland, and Vernon counties. In terms of partisan lean, Biden was able to win 7% of Republicans in the state, which is significant, as they voted in this cycle by about 5 points more than Democrats. More importantly, Biden won independent voters by 12 points; Hillary Clinton lost this bloc to Trump by 10 points in 2016.

### Pivot counties

Wisconsin is a state with a notable number of pivot counties, meaning counties carried by Obama in the 2008 and 2012 U.S. presidential elections that then flipped for the Republican candidate, Trump, in 2016. Of Wisconsin's 72 counties, about one-third (N=23, 32%) are considered to be pivot counties, and pivot counties include 17.35 percent of the state population. Lists of Wisconsin pivot counties a) retained by the Republican presidential candidate in 2020 (Trump) and b) boomerang counties "returning" to the Democratic presidential candidate in 2020 (Biden) are below.

#### Boomerang pivot counties (returned to Democrat in 2020)
### Edison exit polls

2020 presidential election in Wisconsin by demographic subgroup (Edison exit polling) :
| Demographic subgroup | Biden | Trump | % of total vote |
| Total vote | 49.4 | 48.8 | 99 |
| Ideology ||||
| Liberals | 91 | 8 | 25 |
| Moderates | 60 | 38 | 38 |
| Conservatives | 11 | 88 | 36 |
| Party ||||
| Democrats | 96 | 4 | 32 |
| Republicans | 7 | 93 | 37 |
| Independents | 54 | 42 | 31 |
| Gender ||||
| Men | 44 | 54 | 50 |
| Women | 56 | 43 | 50 |
| Race/ethnicity ||||
| White | 46 | 52 | 86 |
| Black | 92 | 8 | 6 |
| Latino | 60 | 37 | 4 |
| Age ||||
| 18–24 years old | 61 | 33 | 8 |
| 25–29 years old | 56 | 40 | 5 |
| 30–39 years old | 52 | 46 | 14 |
| 40–49 years old | 53 | 46 | 14 |
| 50–64 years old | 46 | 53 | 32 |
| 65 and older | 47 | 53 | 26 |
| Sexual orientation ||||
| LGBT | 80 | 16 | 5 |
| Heterosexual | 48 | 51 | 95 |
| Education ||||
| High school or less | 44 | 54 | 22 |
| Some college education | 49 | 49 | 27 |
| Associate degree | 43 | 56 | 16 |
| Bachelor's degree | 52 | 46 | 23 |
| Postgraduate degree | 68 | 31 | 11 |
| Income ||||
| Under $30,000 | 65 | 31 | 15 |
| $30,000–49,999 | 55 | 44 | 20 |
| $50,000–99,999 | 47 | 52 | 38 |
| $100,000–199,999 | 43 | 56 | 21 |
| Over $200,000 | 45 | 55 | 5 |
| Union households ||||
| Yes | 59 | 40 | 14 |
| No | 48 | 51 | 86 |
| Issue regarded as most important ||||
| Racial inequality | 91 | 6 | 13 |
| Coronavirus | 88 | 11 | 19 |
| Economy | 13 | 85 | 35 |
| Crime and safety | 17 | 82 | 13 |
| Health care | 81 | 19 | 8 |
| Region ||||
| Milwaukee County | 69 | 29 | 14 |
| Milwaukee Suburbs | 41 | 58 | 22 |
| Dane County | 76 | 23 | 10 |
| Fox River Valley/N. Lakeshore | 43 | 55 | 17 |
| Southwest | 47 | 52 | 19 |
| North | 39 | 59 | 17 |
| Area type ||||
| Urban | 69 | 30 | 30 |
| Suburban | 43 | 55 | 49 |
| Rural | 38 | 60 | 22 |
| Family's financial situation today ||||
| Better than four years ago | 16 | 83 | 39 |
| Worse than four years ago | 87 | 12 | 21 |
| About the same | 63 | 35 | 40 |

## Aftermath

On November 6, Trump campaign manager Bill Stepien said: "There have been reports of irregularities in several Wisconsin counties which raise serious doubts about the validity of the results." No evidence of such "irregularities" has been provided by the Trump campaign.
On November 18, the Trump campaign wired nearly $3 million to the Wisconsin Election Commission in a petition for a partial recount of the 2020 presidential election results. The recount would take place in Milwaukee and Dane counties. "These two counties were selected because they are the locations of the worst irregularities," the campaign claimed in a release.
Milwaukee certified its recount results on November 27, 2020, and led to Joe Biden gaining a net 132 votes. Dane certified its recount results on November 29, 2020, and led to Donald Trump gaining a net 45 votes. In total, the recount across the two counties led to Joe Biden increasing his lead by an additional 87 votes.
In July 2022, the Wisconsin Supreme Court stated that "ballot drop boxes are illegal under Wisconsin statutes" in the 2022 United States elections. That ruling was overturned by the same court in July 2024 for the 2024 United States elections.

## Electors

On November 30, Wisconsin Governor Tony Evers certified Wisconsin's electors for Biden. The following electors all cast their vote for Biden:
* Meg Andrietsch
* Shelia Stubbs
* Ronald Martin
* Mandela Barnes
* Khary Penebaker
* Mary Arnold
* Patty Schachtner
* Shannon Holsey
* Tony Evers
* Ben Wikler