# California's 1st congressional district

California's 1st congressional district is a U.S. congressional district in California. Doug LaMalfa, a Republican, has represented the district since January 2013. Currently, it encompasses the northeastern part of the state. Since the 2022 election, it includes the counties of Butte, Colusa, Glenn, Lassen, Modoc, Shasta, Siskiyou, Sutter, and Tehama, and most of Yuba County. The largest cities in the district are Chico, Redding, and Yuba City.
Prior to redistricting in 2021, it included the counties of Butte, Lassen, Modoc, Plumas, Shasta, Sierra, Siskiyou, and Tehama, most of Nevada County, part of Glenn County, and part of Placer County. In the 2021 redistricting, it added the Yuba–Sutter area and removed most of its share of the Sierra Nevada.

## Competitiveness

Prior to 2013, the GOP last held the seat in 1998 when U.S. Representative Frank Riggs decided to run for the U.S. Senate. Riggs was replaced by long-time Democratic Assemblyman and State Senator Mike Thompson. Redistricting in 2001 added Democratic-leaning areas of Yolo County.
John Kerry won the district in 2004 presidential election with 59.7% of the vote. Barack Obama carried the district in 2008 presidential election with 65.60% of the vote. The redistricting after the 2010 census made the district much more Republican-leaning; Mitt Romney and Donald Trump won the district by double digits in 2012, 2016, and 2020 respectively.

## Recent election results from statewide races

| Year | Office | Results |
| 2008 | President | McCain 57% - 43% |
| 2010 | Governor | Whitman 55% - 37% |
| 2010 | Lt. Governor | Maldonado 54% - 32% |
| 2010 | Secretary of State | Dunn 53% - 37% |
| 2010 | Attorney General | Cooley 58% - 30% |
| 2010 | Treasurer | Walters 51% - 40% |
| 2010 | Controller | Strickland 47% - 41% |
| 2012 | President | Romney 59% - 41% |
| 2014 | Governor | Kashkari 58% - 42% |
| 2016 | President | Trump 57% - 36% |
| 2018 | Governor | Cox 63% - 37% |
| 2018 | Attorney General | Bailey 61% - 39% |
| 2020 | President | Trump 58% - 39% |
| 2022 | Senate (Reg.) | Meuser 64% - 36% |
| 2022 | Governor | Dahle 67% - 33% |
| 2022 | Lt. Governor | Underwood Jacobs 65% - 35% |
| 2022 | Secretary of State | Bernosky 64% - 36% |
| 2022 | Attorney General | Hochman 65% - 35% |
| 2022 | Treasurer | Guerrero 65% - 35% |
| 2022 | Controller | Chen 66% - 34% |
| 2024 | President | Trump 61% - 36% |
| 2024 | Senate (Reg.) | Garvey 64% - 36% |

## Composition

| FIPS County Code | County | Seat | Population |
| 7 | Butte | Oroville | 207,172 |
| 11 | Colusa | Colusa | 22,037 |
| 21 | Glenn | Willows | 28,129 |
| 35 | Lassen | Susanville | 28,861 |
| 49 | Modoc | Alturas | 8,500 |
| 89 | Shasta | Redding | 180,366 |
| 93 | Siskiyou | Yreka | 42,905 |
| 101 | Sutter | Yuba City | 97,948 |
| 103 | Tehama | Red Bluff | 64,896 |
| 115 | Yuba | Marysville | 85,722 |
Under the 2020 redistricting, California's 1st district is located in northeastern California, encompassing Butte, Colusa, Glenn, Lassen, Modoc, Shasta, Siskiyou, Sutter, and Tehama Counties, as well as part Yuba County. The area in Yuba County includes the cities of Marysville and Wheatland; and the census-designated places of Beale AFB, Linda, Olivehurst, and Plumas Lake.
Yuba County is split between this district and the 3rd district. They are partitioned by State Highway 70, Ellis Rd, and Union Pacific.

### Cities and CDPs with 10,000 or more people

* Chico – 101,000
* Redding – 93,611
* Yuba City – 70,117
* Linda – 21,654
* Oroville – 20,042
* Susanville – 16,728
* Olivehurst – 16,595
* Red Bluff – 14,710
* Marysville – 12,844
* Anderson – 11,323
* Shasta Lake – 10,371

### 2,500 – 10,000 people

* Live Oak – 9,106
* Corning – 8,244
* Plumas Lake – 8,126
* Oroville East – 8,038
* Magalia – 7,795
* Yreka – 7,807
* Orland – 7,622
* Gridley – 7,421
* Thermalito – 7,198
* Colusa – 6,411
* Willows – 6,072
* Durham – 5,834
* Palermo – 5,555
* Williams – 5,408
* Paradise – 4,764
* Wheatland – 3,873
* Wheatland – 3,712
* Arbuckle – 3,484
* South Oroville – 3,235
* Mount Shasta – 3,223
* Kelly Ridge – 3,006
* Sutter – 2,997
* Weed – 2,862
* Alturas – 2,715

## List of members representing the district

| Member | Party | Dates | Cong ress(es) | Electoral history | Counties |
| District created March 4, 1865 ||||||
| Donald C. McRuer (San Francisco) | Republican | March 4, 1865 – March 3, 1867 | 39th | Elected in 1864. Retired. | 1865–1873 Fresno, Inyo, Kern, Los Angeles, Mariposa, Merced, Monterey, San Diego, San Francisco, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Stanislaus, Tulare |
| Samuel Beach Axtell (San Francisco) | Democratic | March 4, 1867 – March 3, 1871 | 40th 41st | Elected in 1867. Re-elected in 1868. Retired. | 1865–1873 Fresno, Inyo, Kern, Los Angeles, Mariposa, Merced, Monterey, San Diego, San Francisco, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Stanislaus, Tulare |
| Sherman Otis Houghton (San Jose) | Republican | March 4, 1871 – March 3, 1873 | 42nd | Elected in 1871. Redistricted to the 4th district. | 1865–1873 Fresno, Inyo, Kern, Los Angeles, Mariposa, Merced, Monterey, San Diego, San Francisco, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Stanislaus, Tulare |
| Charles Clayton (San Francisco) | Republican | March 4, 1873 – March 3, 1875 | 43rd | Elected in 1872. Retired. | 1873–1885 San Francisco |
| William Adam Piper (San Francisco) | Democratic | March 4, 1875 – March 3, 1877 | 44th | Elected in 1875. Lost re-election. | 1873–1885 San Francisco |
| Horace Davis (San Francisco) | Republican | March 4, 1877 – March 3, 1881 | 45th 46th | Elected in 1876. Re-elected in 1879. Lost re-election. | 1873–1885 San Francisco |
| William Rosecrans (San Francisco) | Democratic | March 4, 1881 – March 3, 1885 | 47th 48th | Elected in 1880. Re-elected in 1882. Retired. | 1873–1885 San Francisco |
| Barclay Henley (Santa Rosa) | Democratic | March 4, 1885 – March 3, 1887 | 49th | Redistricted from the 3rd district and re-elected in 1884. Retired. | 1885–1895 Colusa, Del Norte, Humboldt, Lake, Lassen, Mendocino, Modoc, Napa, Plumas, Shasta, Sierra, Siskiyou, Sonoma, Tehama, Trinity |
| Thomas L. Thompson (Santa Rosa) | Democratic | March 4, 1887 – March 3, 1889 | 50th | Elected in 1886. Lost re-election. | 1885–1895 Colusa, Del Norte, Humboldt, Lake, Lassen, Mendocino, Modoc, Napa, Plumas, Shasta, Sierra, Siskiyou, Sonoma, Tehama, Trinity |
| John J. De Haven (Eureka) | Republican | March 4, 1889 – October 1, 1890 | 51st | Elected in 1888. Resigned to become associate justice of the California Supreme Court. | 1885–1895 Colusa, Del Norte, Humboldt, Lake, Lassen, Mendocino, Modoc, Napa, Plumas, Shasta, Sierra, Siskiyou, Sonoma, Tehama, Trinity |
| Vacant | Vacant | October 1, 1890 – December 9, 1890 | 51st | | 1885–1895 Colusa, Del Norte, Humboldt, Lake, Lassen, Mendocino, Modoc, Napa, Plumas, Shasta, Sierra, Siskiyou, Sonoma, Tehama, Trinity |
| Thomas J. Geary (Santa Rosa) | Democratic | December 9, 1890 – March 3, 1895 | 51st 52nd 53rd | Elected to finish De Haven's term. Also elected the same day in 1890 to the next term. Re-elected in 1892. Lost re-election. | 1885–1895 Colusa, Del Norte, Humboldt, Lake, Lassen, Mendocino, Modoc, Napa, Plumas, Shasta, Sierra, Siskiyou, Sonoma, Tehama, Trinity |
| John All Barham (Santa Rosa) | Republican | March 4, 1895 – March 3, 1901 | 54th 55th 56th | Elected in 1894. Re-elected in 1896. Re-elected in 1898. Retired. | 1895–1903 Del Norte, Humboldt, Lassen, Marin, Mendocino, Modoc, Napa, Plumas, Shasta, Sierra, Siskiyou, Sonoma, Tehama, Trinity |
| Frank Coombs (Napa) | Republican | March 4, 1901 – March 3, 1903 | 57th | Elected in 1900. Lost re-election. | 1895–1903 Del Norte, Humboldt, Lassen, Marin, Mendocino, Modoc, Napa, Plumas, Shasta, Sierra, Siskiyou, Sonoma, Tehama, Trinity |
| James Gillett (Eureka) | Republican | March 4, 1903 – November 4, 1906 | 58th 59th | Elected in 1902. Re-elected in 1904. Resigned when elected Governor. | 1903–1913 Alpine, Amador, Calaveras, Del Norte, El Dorado, Humboldt, Lassen, Mariposa, Modoc, Mono, Nevada, Placer, Plumas, Shasta, Sierra, Siskiyou, Tehama, Trinity, Tuolumne |
| Vacant | Vacant | November 4, 1906 – November 6, 1906 | 59th | | 1903–1913 Alpine, Amador, Calaveras, Del Norte, El Dorado, Humboldt, Lassen, Mariposa, Modoc, Mono, Nevada, Placer, Plumas, Shasta, Sierra, Siskiyou, Tehama, Trinity, Tuolumne |
| William F. Englebright (Nevada City) | Republican | November 6, 1906 – March 3, 1911 | 59th 60th 61st | Elected to finish Gillett's term. Also elected the same day in 1906 to the next term. Re-elected in 1908. Lost re-election. | 1903–1913 Alpine, Amador, Calaveras, Del Norte, El Dorado, Humboldt, Lassen, Mariposa, Modoc, Mono, Nevada, Placer, Plumas, Shasta, Sierra, Siskiyou, Tehama, Trinity, Tuolumne |
| John E. Raker (Alturas) | Democratic | March 4, 1911 – March 3, 1913 | 62nd | Elected in 1910. Redistricted to the 2nd district. | 1903–1913 Alpine, Amador, Calaveras, Del Norte, El Dorado, Humboldt, Lassen, Mariposa, Modoc, Mono, Nevada, Placer, Plumas, Shasta, Sierra, Siskiyou, Tehama, Trinity, Tuolumne |
| William Kent (Kentfield) | Independent | March 4, 1913 – March 3, 1917 | 63rd 64th | Redistricted from the 2nd district and re-elected in 1912. Re-elected in 1914. Retired. | 1943–1953 Butte, Colusa, Del Norte, Glenn, Humboldt, Lake, Marin, Mendocino, Sonoma, Sutter, Yuba |
| Clarence F. Lea (Santa Rosa) | Democratic | March 4, 1917 – January 3, 1949 | 65th 66th 67th 68th 69th 70th 71st 72nd 73rd 74th 75th 76th 77th 78th 79th 80th | Elected in 1916. Re-elected in 1918. Re-elected in 1920. Re-elected in 1922. Re-elected in 1924. Re-elected in 1926. Re-elected in 1928. Re-elected in 1930. Re-elected in 1932. Re-elected in 1934. Re-elected in 1936. Re-elected in 1938. Re-elected in 1940. Re-elected in 1942. Re-elected in 1944. Re-elected in 1946. Retired. | 1943–1953 Butte, Colusa, Del Norte, Glenn, Humboldt, Lake, Marin, Mendocino, Sonoma, Sutter, Yuba |
| Hubert B. Scudder (Sebastopol) | Republican | January 3, 1949 – January 3, 1959 | 81st 82nd 83rd 84th 85th | Elected in 1948. Re-elected in 1950. Re-elected in 1952. Re-elected in 1954. Re-elected in 1956. Retired. | 1943–1953 Butte, Colusa, Del Norte, Glenn, Humboldt, Lake, Marin, Mendocino, Sonoma, Sutter, Yuba |
| Hubert B. Scudder (Sebastopol) | Republican | January 3, 1949 – January 3, 1959 | 81st 82nd 83rd 84th 85th | Elected in 1948. Re-elected in 1950. Re-elected in 1952. Re-elected in 1954. Re-elected in 1956. Retired. | 1953–1963 Del Norte, Humboldt, Lake, Marin, Mendocino, Napa, Sonoma |
| Clement Woodnutt Miller (Corte Madera) | Democratic | January 3, 1959 – October 7, 1962 | 86th 87th | Elected in 1958. Re-elected in 1960. Died. Re-elected posthumously in 1962. | 1953–1963 Del Norte, Humboldt, Lake, Marin, Mendocino, Napa, Sonoma |
| Vacant | Vacant | October 7, 1962 – January 22, 1963 | 87th 88th | | 1953–1963 Del Norte, Humboldt, Lake, Marin, Mendocino, Napa, Sonoma |
| Vacant | Vacant | October 7, 1962 – January 22, 1963 | 87th 88th | | 1963–1967 Del Norte, Humboldt, Marin, Mendocino, Napa, Sonoma |
| Donald H. Clausen (Crescent City) | Republican | January 22, 1963 – January 3, 1975 | 88th 89th 90th 91st 92nd 93rd | Elected to finish Miller's term. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Re-elected in 1970. Re-elected in 1972. Redistricted to the 2nd district. | 1963–1967 Del Norte, Humboldt, Marin, Mendocino, Napa, Sonoma |
| Donald H. Clausen (Crescent City) | Republican | January 22, 1963 – January 3, 1975 | 88th 89th 90th 91st 92nd 93rd | Elected to finish Miller's term. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Re-elected in 1970. Re-elected in 1972. Redistricted to the 2nd district. | 1967–1973 Del Norte, Humboldt, most of Marin, Mendocino, Napa, Sonoma |
| Donald H. Clausen (Crescent City) | Republican | January 22, 1963 – January 3, 1975 | 88th 89th 90th 91st 92nd 93rd | Elected to finish Miller's term. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Re-elected in 1970. Re-elected in 1972. Redistricted to the 2nd district. | 1973–1983 Butte, Glenn, Lassen, Modoc, Nevada, Placer, Plumas, Shasta, Sierra, Siskiyou, Tehama, Trinity, Yuba |
| Harold T. Johnson (Roseville) | Democratic | January 3, 1975 – January 3, 1981 | 94th 95th 96th | Redistricted from the 2nd district and re-elected in 1974. Re-elected in 1976. Re-elected in 1978. Lost re-election. | 1973–1983 Butte, Glenn, Lassen, Modoc, Nevada, Placer, Plumas, Shasta, Sierra, Siskiyou, Tehama, Trinity, Yuba |
| Eugene A. Chappie (Roseville) | Republican | January 3, 1981 – January 3, 1983 | 97th | Elected in 1980. Redistricted to the 2nd district. | 1973–1983 Butte, Glenn, Lassen, Modoc, Nevada, Placer, Plumas, Shasta, Sierra, Siskiyou, Tehama, Trinity, Yuba |
| Douglas H. Bosco (Occidental) | Democratic | January 3, 1983 – January 3, 1991 | 98th 99th 100th 101st | Elected in 1982. Re-elected in 1984. Re-elected in 1986. Re-elected in 1988. Lost re-election. | 1983–1993 Del Norte, Humboldt, western Lake, Mendocino, southern Napa, northern Sonoma |
| Frank Riggs (Santa Rosa) | Republican | January 3, 1991 – January 3, 1993 | 102nd | Elected in 1990. Lost re-election. | 1983–1993 Del Norte, Humboldt, western Lake, Mendocino, southern Napa, northern Sonoma |
| Daniel Hamburg (Ukiah) | Democratic | January 3, 1993 – January 3, 1995 | 103rd | Elected in 1992. Lost re-election. | 1993–2003 Del Norte, Humboldt, western Lake, Mendocino, Napa, northwestern Solano, northeastern Sonoma |
| Frank Riggs (Windsor) | Republican | January 3, 1995 – January 3, 1999 | 104th 105th | Elected in 1994. Re-elected in 1996. Retired to run for U.S. Senator. | 1993–2003 Del Norte, Humboldt, western Lake, Mendocino, Napa, northwestern Solano, northeastern Sonoma |
| Mike Thompson (St. Helena) | Democratic | January 3, 1999 – January 3, 2013 | 106th 107th 108th 109th 110th 111th 112th | Elected in 1998. Re-elected in 2000. Re-elected in 2002. Re-elected in 2004. Re-elected in 2006. Re-elected in 2008. Re-elected in 2010. Redistricted to the 5th district. | 1993–2003 Del Norte, Humboldt, western Lake, Mendocino, Napa, northwestern Solano, northeastern Sonoma |
| Mike Thompson (St. Helena) | Democratic | January 3, 1999 – January 3, 2013 | 106th 107th 108th 109th 110th 111th 112th | Elected in 1998. Re-elected in 2000. Re-elected in 2002. Re-elected in 2004. Re-elected in 2006. Re-elected in 2008. Re-elected in 2010. Redistricted to the 5th district. | 2003–2013 Del Norte, Humboldt, Lake, Mendocino, Napa, eastern Sonoma, southern Yolo |
| Doug LaMalfa (Oroville) | Republican | January 3, 2013 – present | 113th 114th 115th 116th 117th 118th 119th | Elected in 2012. Re-elected in 2014. Re-elected in 2016. Re-elected in 2018. Re-elected in 2020. Re-elected in 2022. Re-elected in 2024. | 2013–2023 Inland Northern California including Butte, Lassen, Modoc, Plumas, Shasta, Sierra, Siskiyou, and Tehama counties, plus portions of Glenn, Nevada, and Placer counties. Including the main hubs of Chico and Redding, in Butte and Shasta counties respectively. |
| Doug LaMalfa (Oroville) | Republican | January 3, 2013 – present | 113th 114th 115th 116th 117th 118th 119th | Elected in 2012. Re-elected in 2014. Re-elected in 2016. Re-elected in 2018. Re-elected in 2020. Re-elected in 2022. Re-elected in 2024. | 2023–present |

## Election results
### 1864

1864 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Donald C. McRuer | 20,370 | 58.9 |
| | Democratic | Joseph B. Crocker | 14,191 | 41.1 |
| Total votes | Total votes | Total votes | 34,561 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1866

1866 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Samuel Beach Axtell | 18,793 | 57.3 |
| | Republican | Timothy Guy Phelps | 13,989 | 42.7 |
| Total votes | Total votes | Total votes | 32,782 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1868

1868 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Samuel Beach Axtell (Incumbent) | 23,632 | 54.1 |
| | Republican | Frank M. Pixley | 20,081 | 45.9 |
| Total votes | Total votes | Total votes | 43,713 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1870

1870 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Sherman Otis Houghton | 25,971 | 51.6 |
| | Democratic | Lawrence Archer | 24,374 | 48.4 |
| Total votes | Total votes | Total votes | 50,345 | 100.0 |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

### 1872

1872 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles Clayton | 11,938 | 52.3 |
| | Democratic | William Adam Piper | 10,883 | 47.7 |
| Total votes | Total votes | Total votes | 22,821 | 100.0 |
| | Republican win (new seat) | Republican win (new seat) | Republican win (new seat) | Republican win (new seat) |

### 1874

1874 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | William Adam Piper | 12,417 | 49.1 |
| | Republican | Ira P. Rankin | 6,791 | 26.8 |
| | Independent | John F. Swift | 6,103 | 24.1 |
| Total votes | Total votes | Total votes | 25,311 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1876

1876 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Horace Davis | 22,134 | 53.3 |
| | Democratic | William Adam Piper (Incumbent) | 19,363 | 46.7 |
| Total votes | Total votes | Total votes | 41,497 | 100.0 |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

### 1878

1878 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Horace Davis (Incumbent) | 20,074 | 48.4 |
| | Independent | Clitus Barbour | 18,449 | 44.5 |
| | Democratic | Charles R. Summer | 2,940 | 7.1 |
| Total votes | Total votes | Total votes | 41,463 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1880

1880 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | William Rosecrans | 21,005 | 51.0 |
| | Republican | Horace Davis (Incumbent) | 19,496 | 47.3 |
| | Greenback | Stephen Maybell | 683 | 1.7 |
| Total votes | Total votes | Total votes | 41,184 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1882

1882 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | William Rosecrans (Incumbent) | 22,733 | 59.5 |
| | Republican | Paul Neumann | 14,847 | 38.8 |
| | Prohibition | James M. Shafter | 580 | 1.5 |
| | Greenback | H. S. Fitch | 67 | 0.2 |
| Total votes | Total votes | Total votes | 38,227 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1884

1884 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Barclay Henley | 16,461 | 49.7 |
| | Republican | Thomas L. Carothers | 16,316 | 49.3 |
| | Independent | C. C. Bateman | 321 | 1.0 |
| Total votes | Total votes | Total votes | 33,098 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1886

1886 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Thomas Larkin Thompson | 16,499 | 50.1 |
| | Republican | Charles A. Garter | 15,526 | 47.1 |
| | Prohibition | L. W. Simmons | 849 | 2.6 |
| | Independent | Philip Cowen | 80 | 0.2 |
| Total votes | Total votes | Total votes | 32,954 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1888

1888 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | John J. De Haven | 19,345 | 49.9 |
| | Democratic | Thomas Larkin Thompson (Incumbent) | 19,019 | 49.0 |
| | Know Nothing | W. D. Reynolds | 428 | 1.1 |
| Total votes | Total votes | Total votes | 38,792 | 100.0 |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

### 1890 Special & General

1890 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Thomas J. Geary | 19,334 | 49.3 |
| | Republican | John All Barham | 19,153 | 48.8 |
| | Prohibition | L. B. Scranton | 759 | 1.9 |
| Total votes | Total votes | Total votes | 39,246 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1892

1892 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Thomas J. Geary (Incumbent) | 19,308 | 56.8 |
| | Republican | Edward W. Davis | 13,123 | 38.6 |
| | Populist | C. C. Swafford | 1,546 | 4.6 |
| Total votes | Total votes | Total votes | 33,977 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1894

1894 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | John All Barham | 15,101 | 41.1 |
| | Democratic | Thomas J. Geary (Incumbent) | 13,570 | 37.0 |
| | Populist | Roger F. Grigsby | 7,246 | 19.7 |
| | Prohibition | J. R. Gregory | 790 | 2.2 |
| Total votes | Total votes | Total votes | 36,707 | 100.0 |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

### 1896

1896 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | John All Barham (Incumbent) | 17,826 | 49.7 |
| | Democratic | Fletcher A. Cutler | 16,328 | 45.5 |
| | Populist | George W. Montieth | 1,497 | 4.2 |
| | Prohibition | B. F. Taylor | 249 | 0.7 |
| Total votes | Total votes | Total votes | 35,900 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1898

1898 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | John All Barham (Incumbent) | 19,598 | 51.8 |
| | Democratic | Emmett Seawell | 18,244 | 48.2 |
| Total votes | Total votes | Total votes | 37,842 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1900

1900 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Frank Coombs | 21,227 | 55.3 |
| | Democratic | James F. Farraher | 16,270 | 42.4 |
| | Social Democratic | William Morgan | 599 | 1.6 |
| | Prohibition | Charles T. Clark | 310 | 0.8 |
| Total votes | Total votes | Total votes | 38,406 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1902

1902 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | James Gillett | 21,268 | 50.5 |
| | Democratic | Anthony Caminetti | 19,696 | 46.7 |
| | Socialist | M. F. Shore | 810 | 1.9 |
| | Prohibition | W. O. Clark | 362 | 0.9 |
| Total votes | Total votes | Total votes | 42,136 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1904

1904 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | James Gillett (Incumbent) | 21,602 | 54.1 |
| | Democratic | Anthony Caminetti | 15,706 | 39.3 |
| | Socialist | A. J. Gaylord | 2,197 | 5.5 |
| | Prohibition | Jarrot L. Rollins | 421 | 1.1 |
| Total votes | Total votes | Total votes | 39,926 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1906 (Special)

1906 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | William F. Englebright | 18,125 | 95.2 |
| | Democratic | F. W. Taft | 539 | 2.8 |
| | Socialist | J. C. Weybright | 325 | 1.7 |
| | Prohibition | R. L. Webb | 51 | 0.3 |
| Total votes | Total votes | Total votes | 19,040 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1906 (General)

1906 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | William F. Englebright | 18,954 | 54.0 |
| | Democratic | F. W. Taft | 13,984 | 39.9 |
| | Socialist | J. C. Weybright | 1,736 | 5.0 |
| | Prohibition | R. L. Webb | 392 | 1.1 |
| Total votes | Total votes | Total votes | 35,066 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1908

1908 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | William F. Englebright (Incumbent) | 20,624 | 54.1 |
| | Democratic | E. W. Holland | 14,031 | 36.8 |
| | Socialist | D. N. Cunningham | 2,898 | 7.6 |
| | Prohibition | W. P. Fassett | 546 | 1.4 |
| Total votes | Total votes | Total votes | 38,099 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1910

1910 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | John E. Raker | 16,704 | 45.4 |
| | Republican | William F. Englebright (Incumbent) | 16,570 | 45.1 |
| | Socialist | William Morgan | 3,231 | 8.8 |
| | Prohibition | C. H. Essex | 259 | 0.7 |
| Total votes | Total votes | Total votes | 37,064 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1912

1912 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Independent | William Kent | 20,341 | 37.3 |
| | Democratic | I. G. Zumwalt | 18,756 | 34.4 |
| | Republican | Edward H. Hart | 10,585 | 19.4 |
| | Socialist | Joseph Bredsteen | 4,892 | 9.0 |
| Total votes | Total votes | Total votes | 54,574 | 100.0 |
| | Independent gain from Democratic | Independent gain from Democratic | Independent gain from Democratic | Independent gain from Democratic |

### 1914

1914 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Independent | William Kent (Incumbent) | 35,403 | 48.1 |
| | Republican | Edward H. Hart | 28,166 | 38.3 |
| | Democratic | O. F. Meldon | 7,987 | 10.8 |
| | Prohibition | Henry P. Stipp | 2,068 | 2.8 |
| Total votes | Total votes | Total votes | 73,624 | 100.0 |
| | Independent hold | Independent hold | Independent hold | Independent hold |

### 1916

1916 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea | 32,797 | 48.8 |
| | Republican | Edward H. Hart | 28,769 | 42.8 |
| | Socialist | Mary M. Morgan | 3,730 | 5.5 |
| | Prohibition | Jay Scott Ryder | 1,935 | 2.9 |
| Total votes | Total votes | Total votes | 67,231 | 100.0 |
| | Democratic gain from Independent | Democratic gain from Independent | Democratic gain from Independent | Democratic gain from Independent |

### 1918

1918 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 42,063 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1920

1920 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 34,427 | 61.7 |
| | Republican | C. A. Bodwell Jr. | 18,569 | 33.3 |
| | Socialist | A. K. Gifford | 2,773 | 5.0 |
| Total votes | Total votes | Total votes | 55,769 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1922

1922 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 53,129 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1924

1924 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 47,250 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1926

1926 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 60,207 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1928

1928 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 56,381 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1930

1930 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 66,703 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1932

1932 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 73,400 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1934

1934 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 98,661 | 93.6 |
| | Socialist | Allen K. Gifford | 6,698 | 6.4 |
| Total votes | Total votes | Total votes | 105,359 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1936

1936 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 58,073 | 53.8 |
| | Republican | Nelson B. Van Matre | 48,647 | 45.1 |
| | Communist | Vernon Dennis Healy | 1,218 | 1.1 |
| Total votes | Total votes | Total votes | 107,938 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1938

1938 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 73,636 | 63 |
| | Townsend | Ernest S. Mitchell | 43,320 | 37 |
| Total votes | Total votes | Total votes | 116,956 | 100 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1940

1940 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 103,547 | 93.3 |
| | Communist | Albert J. Lima | 5,647 | 5.1 |
| | Independent | Ernest S. Mitchell (write-in) | 1,828 | 1.6 |
| Total votes | Total votes | Total votes | 111,022 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1942

1942 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 78,281 | 93.2 |
| | Communist | Albert J. Lima | 5,703 | 6.8 |
| Total votes | Total votes | Total votes | 83,984 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1944

1944 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 92,706 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1946

1946 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clarence F. Lea (Incumbent) | 77,653 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1948

1948 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Hubert B. Scudder | 82,947 | 54.5 |
| | Democratic | Sterling J. Norgard | 68,951 | 45.3 |
| | Progressive | Roger Kent (write-in) | 304 | 0.2 |
| Total votes | Total votes | Total votes | 152,302 | 100.0 |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

### 1950

1950 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Hubert B. Scudder (Incumbent) | 85,122 | 54.0 |
| | Democratic | Roger Kent | 72,584 | 46.0 |
| Total votes | Total votes | Total votes | 157,706 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1952

1952 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Hubert B. Scudder (Incumbent) | 137,801 | 86.4 |
| | Progressive | Carl Sullivan | 21,734 | 13.6 |
| Total votes | Total votes | Total votes | 159,535 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1954

1954 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Hubert B. Scudder (Incumbent) | 83,762 | 59.1 |
| | Democratic | Max Kortum | 58,004 | 40.9 |
| Total votes | Total votes | Total votes | 141,766 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1956

1956 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Hubert B. Scudder (Incumbent) | 102,604 | 53.6 |
| | Democratic | Clement Woodnutt Miller | 88,962 | 46.4 |
| Total votes | Total votes | Total votes | 191,566 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1958

1958 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clement Woodnutt Miller | 102,096 | 54.9 |
| | Republican | Frederick G. Dupuis | 84,807 | 45.1 |
| Total votes | Total votes | Total votes | 185,903 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1960

1960 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clement Woodnutt Miller (Incumbent) | 115,829 | 51.6 |
| | Republican | Frederick G. Dupuis | 108,505 | 48.4 |
| Total votes | Total votes | Total votes | 224,334 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1962

1962 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Clement Woodnutt Miller (Incumbent) | 100,962 | 50.8 |
| | Republican | Donald H. Clausen | 97,949 | 49.2 |
| Total votes | Total votes | Total votes | 198,911 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1963 (Special)

1963 Special election :
| Party | Party | Candidate | Votes | % |
| | Republican | Don H. Clausen | | 54.2 |
| | Democratic | William F. Grader | | 44.7 |
| | Democratic | John C. Stuart (write-in) | | 1.1 |
| Total votes | Total votes | Total votes | | 100.0 |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

### 1964

1964 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Donald H. Clausen (Incumbent) | 141,048 | 59.1 |
| | Democratic | George McCabe | 97,651 | 40.9 |
| Total votes | Total votes | Total votes | 238,699 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1966

1966 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Donald H. Clausen (Incumbent) | 143,755 | 65.1 |
| | Democratic | Thomas T. Storer | 77,000 | 34.9 |
| Total votes | Total votes | Total votes | 220,755 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1968

1968 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Donald H. Clausen (Incumbent) | 132,433 | 75.1 |
| | Democratic | Donald W. Graham | 37,650 | 21.4 |
| | Peace and Freedom | Adolph N. Hofmann | 3,372 | 1.9 |
| | American Independent | Gladys O'Neil | 2,882 | 1.6 |
| Total votes | Total votes | Total votes | 176,337 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1970

1970 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Donald H. Clausen (Incumbent) | 108,358 | 63.5 |
| | Democratic | William Kortum | 62,688 | 36.5 |
| Total votes | Total votes | Total votes | 171,046 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1972

1972 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Donald H. Clausen (Incumbent) | 140,807 | 62.2 |
| | Democratic | William A. Nighswonger | 77,138 | 34.1 |
| | Peace and Freedom | Jonathan T. Ames | 8,470 | 3.7 |
| Total votes | Total votes | Total votes | 226,145 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1974

1974 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Harold T. Johnson (Incumbent) | 137,849 | 85.8 |
| | American Independent | Dorothy D. Paradis | 22,628 | 14.2 |
| Total votes | Total votes | Total votes | 160,477 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1976

1976 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Harold T. Johnson (Incumbent) | 160,477 | 73.9 |
| | Republican | James E. Taylor | 56,539 | 26.1 |
| Total votes | Total votes | Total votes | 217,016 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1978

1978 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Harold T. Johnson (Incumbent) | 125,122 | 59.4 |
| | Republican | James E. Taylor | 85,690 | 40.6 |
| Total votes | Total votes | Total votes | 210,812 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1980

1980 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Eugene A. Chappie | 145,098 | 53.7 |
| | Democratic | Harold T. Johnson (Incumbent) | 107,682 | 39.8 |
| | Libertarian | Jim McClarin | 17,419 | 6.5 |
| Total votes | Total votes | Total votes | 270,199 | 100.0 |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

### 1982

1982 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Douglas H. Bosco | 107,749 | 49.8 |
| | Republican | Donald H. Clausen (Incumbent) | 102,043 | 47.2 |
| | Libertarian | David Redick | 6,374 | 2.9 |
| Total votes | Total votes | Total votes | 216,166 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1984

1984 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Douglas H. Bosco (Incumbent) | 157,037 | 62.3 |
| | Republican | Floyd G. Sampson | 95,186 | 37.7 |
| Total votes | Total votes | Total votes | 252,223 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1986

1986 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Douglas H. Bosco (Incumbent) | 138,174 | 67.5 |
| | Republican | Floyd G. Sampson | 54,436 | 26.6 |
| | Peace and Freedom | Elden McFarland | 12,149 | 5.9 |
| Total votes | Total votes | Total votes | 204,759 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1988

1988 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Douglas H. Bosco (Incumbent) | 159,815 | 62.9 |
| | Republican | Samuel "Mark" Vanderbilt | 72,189 | 28.4 |
| | Peace and Freedom | Eric Fried | 22,150 | 8.7 |
| Total votes | Total votes | Total votes | 254,154 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1990

1990 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Frank Riggs | 99,782 | 43.3 |
| | Democratic | Douglas H. Bosco (Incumbent) | 96,468 | 41.9 |
| | Peace and Freedom | Darlene G. Comingore | 34,011 | 14.8 |
| Total votes | Total votes | Total votes | 230,261 | 100.0 |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

### 1992

1992 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Dan Hamburg | 119,676 | 47.6 |
| | Republican | Frank Riggs (Incumbent) | 113,266 | 45.1 |
| | Peace and Freedom | Phil Baldwin | 10,764 | 4.3 |
| | Libertarian | Matthew L. Howard | 7,500 | 3.0 |
| Total votes | Total votes | Total votes | 251,206 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1994

1994 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Frank Riggs | 106,870 | 53.3 |
| | Democratic | Dan Hamburg (Incumbent) | 93,717 | 46.7 |
| | No party | Chase (write-in) | 86 | 0.0 |
| Total votes | Total votes | Total votes | 200,673 | 100.0 |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

### 1996

1996 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Frank Riggs (Incumbent) | 110,242 | 49.7 |
| | Democratic | Michela Alioto | 96,522 | 43.4 |
| | Libertarian | Emil Rossi | 15,354 | 6.9 |
| Total votes | Total votes | Total votes | 222,118 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1998

1998 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Thompson | 121,713 | 61.9 |
| | Republican | Mark Luce | 64,622 | 32.8 |
| | Libertarian | Emil Rossi | 5,404 | 2.8 |
| | Peace and Freedom | Ernest K. Jones Jr. | 4,996 | 2.5 |
| | Republican | Lawrence R. Weisner (write-in) | 37 | 0.0 |
| Total votes | Total votes | Total votes | 196,772 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 2000

2000 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Thompson (Incumbent) | 155,638 | 65.1 |
| | Republican | Russel J. "Jim" Chase | 66,987 | 28.0 |
| | Natural Law | Cheryl Kreier | 7,173 | 3.0 |
| | Libertarian | Emil P. Rossi | 6,376 | 2.6 |
| | Reform | Pamela Elizondo | 3,161 | 1.3 |
| Total votes | Total votes | Total votes | 239,335 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2002

2002 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Thompson (Incumbent) | 118,669 | 64.1 |
| | Republican | Lawrence R. Wiesner | 60,013 | 32.4 |
| | Libertarian | Kevin Bastian | 6,534 | 3.5 |
| Total votes | Total votes | Total votes | 185,216 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2004

2004 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Thompson (Incumbent) | 189,336 | 67.0 |
| | Republican | Lawrence R. Wiesner | 79,970 | 28.2 |
| | Green | Pamela Elizondo | 13,635 | 4.8 |
| Total votes | Total votes | Total votes | 282,941 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2006

2006 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Thompson (Incumbent) | 144,409 | 66.3 |
| | Republican | John W. Jones | 63,194 | 29.0 |
| | Green | Pamela Elizondo | 6,899 | 3.1 |
| | Peace and Freedom | Timothy J. Stock | 3,503 | 1.6 |
| Total votes | Total votes | Total votes | 218,044 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2008

2008 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Thompson (Incumbent) | 154,006 | 68.2 |
| | Republican | Zane Starkewolf | 53,561 | 23.7 |
| | Green | Carol Wolman | 18,492 | 8.1 |
| Total votes | Total votes | Total votes | 226,059 | 100.00 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2010

2010 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Thompson (Incumbent) | 136,605 | 62.8 |
| | Republican | Loren Hanks | 67,217 | 31.1 |
| | Green | Carol Wolman | 7,576 | 3.6 |
| | Libertarian | Mike Rodrigues | 5,484 | 2.5 |
| Total votes | Total votes | Total votes | 216,882 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2012

2012 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Doug LaMalfa | 168,827 | 57.4 |
| | Democratic | Jim Reed | 131,548 | 42.6 |
| Total votes | Total votes | Total votes | 294,213 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2014

2014 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Doug LaMalfa (Incumbent) | 132,052 | 61.0 |
| | Democratic | Heidi Hall | 84,320 | 39.0 |
| Total votes | Total votes | Total votes | 216,372 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2016

2016 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Doug LaMalfa (Incumbent) | 185,338 | 59.1 |
| | Democratic | Jim Reed | 128,588 | 40.9 |
| Total votes | Total votes | Total votes | 314,036 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2018

2018 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Doug LaMalfa (Incumbent) | 160,046 | 54.9 |
| | Democratic | Audrey Denney | 131,548 | 45.1 |
| Total votes | Total votes | Total votes | 291,594 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2020

California's 1st district primary election, 2020 :
| Party | Party | Candidate | Votes | % |
| | Republican | Doug LaMalfa (Incumbent) | 128,613 | 54.6 |
| | Democratic | Audrey Denney | 92,655 | 39.4 |
| | Democratic | Rob Lydon | 8,745 | 3.7 |
| | Independent | Joseph LeTourneau IV | 2,769 | 1.2 |
| | Independent | Gregory Edward Cheadle | 2,596 | 1.1 |
| | Republican | Kenneth E Swanson (write-in) | 13 | 0.0 |
| Total votes | Total votes | Total votes | 235,391 | 100.0 |
California's 1st district general election, 2020 :
| Party | Party | Candidate | Votes | % |
| | Republican | Doug LaMalfa (incumbent) | 204,190 | 57.0 |
| | Democratic | Audrey Denney | 154,073 | 43.0 |
| Total votes | Total votes | Total votes | 358,263 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2022

California's 1st district primary election, 2022 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Doug LaMalfa (incumbent) | 96,858 | 57.1 |
| | Democratic | Max Steiner | 55,549 | 32.8 |
| | Republican | Tim Geist | 11,408 | 6.7 |
| | No party preference | Rose Penelope Yee | 5,777 | 3.4 |
| Total votes | Total votes | Total votes | 169,592 | 100.0 |
| General election |||||
| | Republican | Doug LaMalfa (incumbent) | 152,839 | 62.1 |
| | Democratic | Max Steiner | 93,386 | 37.9 |
| Total votes | Total votes | Total votes | 246,225 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2024

California's 1st congressional district, 2024 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Doug LaMalfa (incumbent) | 122,858 | 66.7 |
| | Democratic | Rose Penelope Yee | 41,669 | 22.6 |
| | Democratic | Mike Doran | 19,734 | 10.7 |
| Total votes | Total votes | Total votes | 184,261 | 100.0 |
| General election |||||
| | Republican | Doug LaMalfa (incumbent) | 208,592 | 65.3 |
| | Democratic | Rose Penelope Yee | 110,636 | 34.7 |
| Total votes | Total votes | Total votes | 319,228 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |