# California's 10th congressional district

California's 10th congressional district is a congressional district in the U.S. state of California. Currently, the 10th district encompasses parts of the eastern San Francisco Bay Area. It is currently represented by Democrat Mark DeSaulnier.
The district previously included all of Stanislaus County and part of San Joaquin County. It was centered on Modesto. Cities in the district included Oakdale, Manteca, Modesto, Tracy, and Turlock.
Redistricting before the 2022 elections moved the district to the San Francisco Bay Area. It includes the cities of Concord, Walnut Creek, Danville, San Ramon, Brentwood, and southern Antioch in Contra Costa County, and eastern Dublin in Alameda County. It was essentially the successor of the old 11th district.

## History
### Until 2012

Prior to redistricting by the California Citizens Redistricting Commission going into effect in 2012, the 10th district stretched from Livermore to Dixon and the outskirts of Vacaville. It consisted of portions of Alameda, Contra Costa, Sacramento, and Solano Counties.
Following redistricting in 1992, the 10th district was based in the East Bay, and included parts of Alameda and Contra Costa counties. It received national attention in 1996 when Democrat Ellen Tauscher defeated incumbent Republican Bill Baker in what was considered an upset.
In the 2002 redistricting of California, all seats were made safe for the parties of incumbent officeholders. The district boundaries were extended to include parts of Solano County, southwestern Sacramento County, eastern Contra Costa County and El Cerrito in western Contra Costa County. Although much of the suburban Tri-Valley region was shifted to the 11th congressional district, the city of Livermore remained in the 10th at Tauscher's request (as a member of the U.S. House Committee on Energy and Commerce, she had some oversight responsibilities over the U.S. Department of Energy, and hence indirectly of Lawrence Livermore National Laboratory).
On June 26, 2009, Tauscher resigned her seat to be sworn in as Undersecretary of State for Arms Control and International Security. In the ensuing special election held on November 3, 2009, former Democratic Lieutenant Governor John Garamendi won the seat over Republican David Harmer 53.0% to 42.7%. Immediately following redistricting, Garamendi successfully ran for re-election in California's 3rd congressional district, which shares many municipalities with the 2002 version of the 10th district (e.g. Vacaville and Fairfield), but lies significantly northwest of the current 10th district.

### 2012 – 2022

The 10th congressional district starting with the election of 2012 and lasting through the election of 2020 included all of Stanislaus County (including Ceres, Oakdale, Modesto, Riverbank, and Turlock) and the southern portion of San Joaquin County (including Tracy and Manteca).
This went into effect in 2012, as the result of redistricting by the California Citizens Redistricting Commission. This version of the 10th included much of the core of the old 18th district (Modesto, Ceres, and the southwestern half of Stanislaus County), though the 18th also included a substantial portion of Stockton. It also shares much of the northwestern portion of the old 19th district (Turlock, Riverbank, Oakdale, and the rest of northeastern Stanislaus County).
Republican Jeff Denham transferred from the prior 19th district to the newer 10th. He held it for three terms until being defeated in 2018 by Democrat Josh Harder, who won reelection in 2020.

### After 2022

The 10th district was redrawn in time for the 2022 election, being divided up between California's 5th congressional district (which now includes eastern portions of Modesto and eastern portions of Turlock), California's 9th congressional district (which is centered on Stockton, California and includes Tracy), and California's 13th congressional district (which includes western Modesto and western Turlock) . The 2022 10th district incumbent Josh Harder was reelected and moved to the new version of California's 9th congressional district. The district has been represented since Jan 3, 2023 by Mark DeSaulnier.

### Voter registration statistics

The California secretary of state publishes reports on California voter registration on a regular basis. Before the 2018 primary election, they published a report dating May 21, 2018.
| Date | Democratic | Republican | American Independent | Green | Libertarian | No Party Preference |
| May 21, 2018 | 127,878 | 117,900 | 10,011 | 959 | 2,484 | 70,251 |

## Recent election results from statewide races

| Year | Office | Results |
| 2008 | President | Obama 64% - 35% |
| 2010 | Governor | Brown 55% - 42% |
| 2010 | Lt. Governor | Newsom 54% - 40% |
| 2010 | Secretary of State | Bowen 55% - 39% |
| 2010 | Attorney General | Harris 47% - 46% |
| 2010 | Treasurer | Lockyer 59% - 35% |
| 2010 | Controller | Chiang 55% - 37% |
| 2012 | President | Obama 62% - 38% |
| 2014 | Governor | Brown 64% - 36% |
| 2016 | President | Clinton 65% - 29% |
| 2018 | Governor | Newsom 64% - 36% |
| 2018 | Attorney General | Becerra 65% - 35% |
| 2020 | President | Biden 69% - 29% |
| 2022 | Senate (Reg.) | Padilla 66% - 34% |
| 2022 | Governor | Newsom 65% - 35% |
| 2022 | Lt. Governor | Kounalakis 66% - 34% |
| 2022 | Secretary of State | Weber 65% - 35% |
| 2022 | Attorney General | Bonta 64% - 36% |
| 2022 | Treasurer | Ma 64% - 36% |
| 2022 | Controller | Cohen 59% - 41% |
| 2024 | President | Harris 65% - 31% |
| 2024 | Senate (Reg.) | Schiff 64% - 36% |

## Composition

| FIPS County Code | County | Seat | Population |
| 1 | Alameda | Oakland | 1,622,188 |
| 13 | Contra Costa | Martinez | 1,161,413 |
Under the 2020 redistricting, California's 10th congressional district is located in the San Francisco Bay Area, encompassing most of Contra Costa County, and part of Alameda County. The area in Contra Costa County includes the south sides of the cities of Antioch and Martinez; the cities of Concord, Brentwood, Oakley, Pleasant Hill, Clayton, Walnut Creek, Lafayette, Orinda, and San Ramon; the towns of Danville and Moraga; and the census-designated places Norris Canyon, Camino Tassajara, Blackhawk, Diablo, Alamo, Castle Hill, Saranap, Acalanes Ridge, San Miguel, North Gate, Shell Ridge, Contra Costa Centre, Reliez Valley, Alhambra Valley, Mountain View, Vine Hill, Pacheco, Clyde, Knightsen, and Bethel Island. The area in Alameda County includes the eastern portion of the city of Dublin.
Contra Costa County is split between this district, the 8th district, and the 9th district. The northern border is partitioned by Grizzly Peak Blvd, Seaview Trail, Camino Pablo, Bear Creek Rd, San Pablo Creek, Bear Creek, Brianes Reservoir, Burlington Northern Santa Fe, Highway 4, Alhambra Ave, Pacheco Blvd, Grandview Ave, Central Ave, Imhoff Dr, Bares Ave, Mount Diablo Creek, Union Pacific, Contra Costa Canal, 4WD Rd, Bailey Rd, James Donlon Blvd, Cambridge Dr, Reseda Way, S Royal links Cir, Carpinteria Dr, Barmouth Dr, Hillcrest Ave, Highway 4, and Highway 160. The western border is partitioned by Old River, Italian Slough, Western Farms Ranch Rd, Rankin Rd, Highway J14, Byron Hot Springs Rd, Camino Diablo, Kellogg Creek, Sellers Ave, Brentwood Blvd, Alloro Dr, Ghiggeri Dr, Emilio Dr, Guthrie Ln, Balfour Rd, Chestnut St, Byron Highway, Orwood Rd, Burlington Northern Santa Fe, Werner Dredger Cut, and Rock Slough.
Alameda County is split between this district and the 12th, 14th, and 17th districts. They are partitioned by Sinclair Freeway, Amador Valley Blvd, Emerald Ave, Tamarack Dr, Brighton Dr, Ione Way, Newcastle Ln, Dougherty Rd, Highway 580, Lembert Hills Dr.

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

* Concord – 125,410
* Antioch – 115,291
* San Ramon – 84,605
* Dublin – 72,589
* Walnut Creek – 70,127
* Brentwood – 64,292
* Danville – 43,582
* Oakley – 43,357
* Martinez – 37,287
* Pleasant Hill – 34,613
* Lafayette – 25,391
* Orinda – 19,514
* Moraga – 16,870
* Alamo – 15,314
* Clayton – 11,070

### 2,500 – 10,000 people

* Blackhawk – 9,647
* Contra Costa Centre – 6,808
* Saranap – 5,202
* Camino Tassajara – 4,951
* Pacheco – 4,183
* Vine Hill – 3,761
* San Miguel – 3,172
* Reliez Valley – 3,101

## List of members representing the district

| Member | Party | Dates | Cong ress | Electoral history | Counties |
| District created March 4, 1913 ||||||
| William Stephens (Los Angeles) | Progressive | March 4, 1913 – July 22, 1916 | 63rd 64th | Redistricted from the 7th district and re-elected in 1912. Re-elected in 1914. Resigned to become Lieutenant Governor of California. | 1913–1933 Los Angeles (Los Angeles) |
| Vacant | Vacant | July 22, 1916 – November 7, 1916 | 64th | | 1913–1933 Los Angeles (Los Angeles) |
| Henry S. Benedict (Los Angeles) | Republican | November 7, 1916 – March 3, 1917 | 64th | Elected to finish Stephens's term. Ran for the next term as a Progressive but withdrew. | 1913–1933 Los Angeles (Los Angeles) |
| Henry Z. Osborne (Los Angeles) | Republican | March 4, 1917 – February 8, 1923 | 65th 66th 67th | Elected in 1916. Re-elected in 1918. Re-elected in 1920. Re-elected in 1922 but died. | 1913–1933 Los Angeles (Los Angeles) |
| Vacant | Vacant | February 8, 1923 – May 1, 1923 | 67th 68th | | 1913–1933 Los Angeles (Los Angeles) |
| John D. Fredericks (Los Angeles) | Republican | May 1, 1923 – March 3, 1927 | 68th 69th | Elected to finish Osborne's term. Re-elected in 1924. Retired. | 1913–1933 Los Angeles (Los Angeles) |
| Joe Crail (Los Angeles) | Republican | March 4, 1927 – March 3, 1933 | 70th 71st 72nd | Elected in 1926. Re-elected in 1928. Re-elected in 1930. Retired. | 1913–1933 Los Angeles (Los Angeles) |
| Henry E. Stubbs (Santa Maria) | Democratic | March 4, 1933 – February 28, 1937 | 73rd 74th 75th | Elected in 1932. Re-elected in 1934. Re-elected in 1936. Died. | 1933–1943 Kern, San Luis Obispo, Santa Barbara, Tulare, Ventura |
| Vacant | Vacant | February 28, 1937 – May 4, 1937 | 75th | | 1933–1943 Kern, San Luis Obispo, Santa Barbara, Tulare, Ventura |
| Alfred J. Elliott (Tulare) | Democratic | May 4, 1937 – January 3, 1949 | 75th 76th 77th 78th 79th 80th | Elected to finish Stubbs's term. Re-elected in 1938. Re-elected in 1940. Re-elected in 1942. Re-elected in 1944. Re-elected in 1946. Retired. | 1933–1943 Kern, San Luis Obispo, Santa Barbara, Tulare, Ventura |
| Alfred J. Elliott (Tulare) | Democratic | May 4, 1937 – January 3, 1949 | 75th 76th 77th 78th 79th 80th | Elected to finish Stubbs's term. Re-elected in 1938. Re-elected in 1940. Re-elected in 1942. Re-elected in 1944. Re-elected in 1946. Retired. | 1943–1953 Kern, Kings, Tulare |
| Thomas H. Werdel (Bakersfield) | Republican | January 3, 1949 – January 3, 1953 | 81st 82nd | Elected in 1948. Re-elected in 1950. Redistricted to the 14th district. Lost re-election. | 1943–1953 Kern, Kings, Tulare |
| Charles Gubser (Gilroy) | Republican | January 3, 1953 – December 31, 1974 | 83rd 84th 85th 86th 87th 88th 89th 90th 91st 92nd 93rd | Elected in 1952. Re-elected in 1954. Re-elected in 1956. Re-elected in 1958. Re-elected in 1960. Re-elected in 1962. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Re-elected in 1970. Re-elected in 1972. Retired and resigned. | 1953–1963 San Benito, Santa Clara, Santa Cruz |
| Charles Gubser (Gilroy) | Republican | January 3, 1953 – December 31, 1974 | 83rd 84th 85th 86th 87th 88th 89th 90th 91st 92nd 93rd | Elected in 1952. Re-elected in 1954. Re-elected in 1956. Re-elected in 1958. Re-elected in 1960. Re-elected in 1962. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Re-elected in 1970. Re-elected in 1972. Retired and resigned. | 1963–1967 San Benito, western Santa Clara |
| Charles Gubser (Gilroy) | Republican | January 3, 1953 – December 31, 1974 | 83rd 84th 85th 86th 87th 88th 89th 90th 91st 92nd 93rd | Elected in 1952. Re-elected in 1954. Re-elected in 1956. Re-elected in 1958. Re-elected in 1960. Re-elected in 1962. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Re-elected in 1970. Re-elected in 1972. Retired and resigned. | 1967–1973 Western Santa Clara |
| Charles Gubser (Gilroy) | Republican | January 3, 1953 – December 31, 1974 | 83rd 84th 85th 86th 87th 88th 89th 90th 91st 92nd 93rd | Elected in 1952. Re-elected in 1954. Re-elected in 1956. Re-elected in 1958. Re-elected in 1960. Re-elected in 1962. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Re-elected in 1970. Re-elected in 1972. Retired and resigned. | 1973–1975 Most of Santa Clara |
| Vacant | Vacant | December 31, 1974 – January 3, 1975 | 93rd | | 1973–1975 Most of Santa Clara |
| Don Edwards (San Jose) | Democratic | January 3, 1975 – January 3, 1993 | 94th 95th 96th 97th 98th 99th 100th 101st 102nd | Redistricted from the 9th district and re-elected in 1974. Re-elected in 1976. Re-elected in 1978. Re-elected in 1980. Re-elected in 1982. Re-elected in 1984. Re-elected in 1986. Re-elected in 1988. Re-elected in 1990. Redistricted to the 16th district. | 1975–1983 Southwest Alameda, northern Santa Clara |
| Don Edwards (San Jose) | Democratic | January 3, 1975 – January 3, 1993 | 94th 95th 96th 97th 98th 99th 100th 101st 102nd | Redistricted from the 9th district and re-elected in 1974. Re-elected in 1976. Re-elected in 1978. Re-elected in 1980. Re-elected in 1982. Re-elected in 1984. Re-elected in 1986. Re-elected in 1988. Re-elected in 1990. Redistricted to the 16th district. | 1983–1993 SW Alameda, Santa Clara (eastern San Jose) |
| Bill Baker (Walnut Creek) | Republican | January 3, 1993 – January 3, 1997 | 103rd 104th | Elected in 1992. Re-elected in 1994. Lost re-election. | 1993–2003 Eastern Alameda, eastern Contra Costa |
| Ellen Tauscher (Alamo) | Democratic | January 3, 1997 – June 26, 2009 | 105th 106th 107th 108th 109th 110th 111th | Elected in 1996. Re-elected in 1998. Re-elected in 2000. Re-elected in 2002. Re-elected in 2004. Re-elected in 2006. Re-elected in 2008. Resigned to become Undersecretary of State for Arms Control and International Security. | 1993–2003 Eastern Alameda, eastern Contra Costa |
| Ellen Tauscher (Alamo) | Democratic | January 3, 1997 – June 26, 2009 | 105th 106th 107th 108th 109th 110th 111th | Elected in 1996. Re-elected in 1998. Re-elected in 2000. Re-elected in 2002. Re-elected in 2004. Re-elected in 2006. Re-elected in 2008. Resigned to become Undersecretary of State for Arms Control and International Security. | 2003–2013 Southeast Alameda, most of Contra Costa, southwest Sacramento, most of Solano |
| Vacant | Vacant | June 26, 2009 – November 3, 2009 | 111th | | 2003–2013 Southeast Alameda, most of Contra Costa, southwest Sacramento, most of Solano |
| John Garamendi (Walnut Creek) | Democratic | November 3, 2009 – January 3, 2013 | 111th 112th | Elected to finish Tauscher's term. Re-elected in 2010. Redistricted to the 3rd district. | 2003–2013 Southeast Alameda, most of Contra Costa, southwest Sacramento, most of Solano |
| Jeff Denham (Turlock) | Republican | January 3, 2013 – January 3, 2019 | 113th 114th 115th | Redistricted from the 19th district and re-elected in 2012. Re-elected in 2014. Re-elected in 2016. Lost re-election. | 2013–2023 Central Valley including Modesto and Tracy |
| Josh Harder (Turlock) | Democratic | January 3, 2019 – January 3, 2023 | 116th 117th | Elected in 2018. Re-elected in 2020. Redistricted to the 9th district. | 2013–2023 Central Valley including Modesto and Tracy |
| Mark DeSaulnier (Concord) | Democratic | January 3, 2023 – present | 118th 119th | Redistricted from the 11th district and re-elected in 2022. Re-elected in 2024. | 2023–present Eastern San Francisco Bay Area, including parts of Stanislaus and San Joaquin |

## Election results for representatives
### 1912

1912 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Progressive | William Stephens (Incumbent) | 43,637 | 53.4 |
| | Democratic | George Ringo | 17,890 | 21.9 |
| | Socialist | Fred C. Wheeler | 17,126 | 21.0 |
| | Prohibition | Emory D. Martindale | 2,995 | 3.7 |
| Total votes | Total votes | Total votes | 81,648 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Progressive hold | Progressive hold | Progressive hold | Progressive hold |

### 1914

1914 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Progressive | William Stephens (Incumbent) | 44,141 | 38.4 |
| | Republican | Henry Z. Osborne | 33,172 | 28.9 |
| | Democratic | Nathan Newby | 17,810 | 15.5 |
| | Socialist | Ralph L. Criswell | 14,900 | 13.0 |
| | Prohibition | Henry Clay Needham | 4,903 | 4.3 |
| Total votes | Total votes | Total votes | 70,926 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Progressive hold | Progressive hold | Progressive hold | Progressive hold |

### 1916 (Special)

1916 10th congressional district special election :
| Party | Party | Candidate | Votes | % |
| | Progressive | Henry S. Benedict (write-in) | 19,062 | 62.82 |
| | Independent | Joy Clark (write-in) | 7,149 | 23.59 |
| | Prohibition | Henry Clay Needham (write-in) | 1,310 | 4.32 |
| | Unknown | George Clark (write-in) | 1,073 | 3.54 |
| | Socialist | James H. Ryckman (write-in) | 911 | 3.01 |
| | Democratic | Rufus V. Bowden (write-in) | 553 | 1.83 |
| | Unknown | John C. Wray (write-in) | 270 | 0.89 |
| Total votes | Total votes | Total votes | 30,328 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Progressive hold | Progressive hold | Progressive hold | Progressive hold |

### 1916

1916 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Henry Z. Osborne | 63,913 | 49.5 |
| | Democratic | Rufus W. Bowden | 33,225 | 25.7 |
| | Progressive | Henry Stanley Benedict | 14,305 | 11.1 |
| | Socialist | James H. Ryckman | 9,000 | 7.0 |
| | Prohibition | Henry Clay Needham | 8,781 | 6.8 |
| Total votes | Total votes | Total votes | 129,224 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1918

1918 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Henry Z. Osborne (Incumbent) | 72,773 | 88.2 |
| | Socialist | James H. Ryckman | 9,725 | 11.8 |
| Total votes | Total votes | Total votes | 82,498 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1920

1920 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Henry Z. Osborne (Incumbent) | 97,469 | 82.7 |
| | Socialist | Upton Sinclair | 20,439 | 17.3 |
| Total votes | Total votes | Total votes | 117,908 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1922

1922 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Henry Z. Osborne (Incumbent) | 98,739 | 100.0 |
| Turnout | Turnout | Turnout | 98,739 | 100 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1923 (Special)

Republican John D. Fredericks won the special election to replace fellow Republican Henry Z. Osborne, who died in office.
1923 10th congressional district special election :
| Party | Party | Candidate | Votes | % |
| | Republican | John D. Fredericks | 28,084 | 36.16 |
| | Republican | Henry Z. Osborne Jr. | 18,103 | 23.31 |
| | Democratic | Lloy Galphin | 13,748 | 17.70 |
| | Republican | Alfred L. Bartlett | 8,857 | 11.40 |
| | Republican | Frank A. McDonald | 5,884 | 7.58 |
| | Prohibition | John C. Bell | 1,875 | 2.41 |
| | Independent | Upton Sinclair | 1,113 | 1.43 |
| Total votes | Total votes | Total votes | 77,664 | 100 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1924

1924 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | John D. Fredericks (Incumbent) | 133,780 | 62.3 |
| | Democratic | Robert W. Richardson | 80,870 | 37.7 |
| Total votes | Total votes | Total votes | 214,650 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1926

1926 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Joe Crail (Incumbent) | 144,677 | 86.8 |
| | Socialist | N. Jackson Wright | 21,997 | 13.2 |
| Total votes | Total votes | Total votes | 166,674 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1928

1928 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Joe Crail (Incumbent) | 301,028 | 93.9 |
| | Democratic | Harry Sherr | 19,659 | 6.1 |
| Total votes | Total votes | Total votes | 320,687 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1930

1930 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Joe Crail (Incumbent) | 162,502 | 75.0 |
| | Democratic | John F. Dockweiler | 54,231 | 25.0 |
| Total votes | Total votes | Total votes | 216,733 | 100 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1932

1932 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Henry E. Stubbs | 50,390 | 55.3 |
| | Republican | Arthur S. Crites | 40,794 | 44.7 |
| Total votes | Total votes | Total votes | 91,184 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1934

1934 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Henry E. Stubbs (Incumbent) | 68,475 | 64.4 |
| | Republican | George R. Bliss | 37,860 | 35.6 |
| Total votes | Total votes | Total votes | 106,335 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1936

1936 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Henry E. Stubbs (Incumbent) | 72,476 | 69.6 |
| | Republican | George R. Bliss | 31,700 | 30.4 |
| Total votes | Total votes | Total votes | 104,176 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1937 (Special)

Democrat Alfred J. Elliott won the special election to replace fellow Democrat Henry E. Stubbs, who died in office.
1937 10th congressional district special election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Alfred J. Elliott | 22,321 | 48.91 |
| | Republican | Harry A. Hopkins | 17,678 | 38.74 |
| | California Progressive Party | Al Sessions | 5,638 | 12.35 |
| Total votes | Total votes | Total votes | 45,637 | 100 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1938

1938 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Alfred J. Elliott (Incumbent) | 84,791 | 67.3 |
| | Republican | F. Fred Hoelscher | 41,194 | 32.7 |
| Total votes | Total votes | Total votes | 125,985 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1940

1940 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Alfred J. Elliott (Incumbent) | 125,845 | 97.0 |
| | Communist | Louretta Adams | 3,826 | 3.0 |
| Total votes | Total votes | Total votes | 129,671 | 100 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1942

1942 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Alfred J. Elliott (Incumbent) | 43,864 | 100.0 |
| Turnout | Turnout | Turnout | 43,864 | 100 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1944

1944 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Alfred J. Elliott (Incumbent) | 60,001 | 100.0 |
| Turnout | Turnout | Turnout | 60,001 | 100 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1946

1946 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Alfred J. Elliott (Incumbent) | 51,843 | 100.0 |
| Turnout | Turnout | Turnout | | 100 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1948

1948 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Thomas H. Werdel | 67,448 | 71.3 |
| | Progressive | Sam James Miller | 27,168 | 28.7 |
| Total votes | Total votes | Total votes | 94,616 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | 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 | Thomas H. Werdel (Incumbent) | 59,313 | 53.6 |
| | Democratic | Harlan Hagen | 51,409 | 46.4 |
| Total votes | Total votes | Total votes | 110,722 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1952

1952 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser | 106,375 | 59.2 |
| | Democratic | Arthur L. Johnson | 70,271 | 39.1 |
| | Progressive | Betsey K. Fisher | 2,939 | 1.7 |
| Total votes | Total votes | Total votes | 179,585 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1954

1954 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser (Incumbent) | 94,418 | 61.2 |
| | Democratic | Paul V. Birmingham | 59,843 | 38.8 |
| Total votes | Total votes | Total votes | 154,261 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1956

1956 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser (Incumbent) | 128,891 | 60.7 |
| | Democratic | William H. Vatcher | 83,586 | 39.3 |
| Total votes | Total votes | Total votes | 212,477 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1958

1958 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser (Incumbent) | 118,715 | 54.6 |
| | Democratic | Russell B. Bryan | 98,894 | 45.4 |
| Total votes | Total votes | Total votes | 217,609 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1960

1960 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser (Incumbent) | 170,063 | 58.9 |
| | Democratic | Russell B. Bryan | 118,520 | 41.1 |
| Total votes | Total votes | Total votes | 288,583 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1962

1962 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser (Incumbent) | 106,419 | 57.4 |
| | Democratic | James P. Thurber Jr. | 68,885 | 42.6 |
| Total votes | Total votes | Total votes | 175,304 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1964

1964 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser (Incumbent) | 151,027 | 63.1 |
| | Democratic | E. Day Carman | 88,240 | 36.9 |
| Total votes | Total votes | Total votes | 239,267 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1966

1966 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser (Incumbent) | 156,549 | 69.1 |
| | Democratic | George Leppert | 70,013 | 30.9 |
| Total votes | Total votes | Total votes | 226,562 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1968

1968 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser (Incumbent) | 160,204 | 67.3 |
| | Democratic | Grayson S. Taketa | 73,530 | 30.9 |
| | Peace and Freedom | Martin L. Primach | 4,276 | 1.8 |
| Total votes | Total votes | Total votes | 238,010 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1970

1970 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser (Incumbent) | 135,864 | 62.0 |
| | Democratic | Stuart. D. McLean | 80,530 | 36.8 |
| | American Independent | Joyce W. Stancliffe | 2,651 | 1.2 |
| Total votes | Total votes | Total votes | 219,045 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1972

1972 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Charles S. Gubser (Incumbent) | 139,850 | 64.6 |
| | Democratic | B. Frank Gillette | 76,597 | 35.4 |
| Total votes | Total votes | Total votes | 216,447 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1974

1974 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Don Edwards (Incumbent) | 86,014 | 77.0 |
| | Republican | Herb Smith | 25,678 | 23.0 |
| Total votes | Total votes | Total votes | 111,692 | 100 |
| Turnout | Turnout | Turnout | | |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1976

1976 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Don Edwards (Incumbent) | 111,992 | 72.0 |
| | Republican | Herb Smith | 38,088 | 24.5 |
| | American Independent | Edmon V. Kaiser | 5,363 | 3.5 |
| Total votes | Total votes | Total votes | 155,443 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1978

1978 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Don Edwards (Incumbent) | 84,488 | 67.1 |
| | Republican | Rudy Hansen | 41,374 | 32.9 |
| Total votes | Total votes | Total votes | 125,862 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1980

1980 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Don Edwards (Incumbent) | 102,231 | 62.1 |
| | Republican | Joseph M. Lutton | 45,987 | 27.9 |
| | Libertarian | Joseph Fuhrig | 11,904 | 7.2 |
| | American Independent | Edmon V. Kaiser | 4,421 | 2.7 |
| Total votes | Total votes | Total votes | 164,543 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1982

1982 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Don Edwards (Incumbent) | 77,263 | 62.7 |
| | Republican | Bob Herriott | 41,506 | 33.7 |
| | Libertarian | Dale Burrow | 2,403 | 1.9 |
| | American Independent | Edmon V. Kaiser | 2,109 | 1.7 |
| Total votes | Total votes | Total votes | 123,281 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1984

1984 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Don Edwards (Incumbent) | 102,469 | 62.4 |
| | Republican | Bob Herriott | 56,256 | 34.3 |
| | Libertarian | Perr Cardestam | 2,789 | 1.7 |
| | American Independent | Edmon V. Kaiser | 2,663 | 1.6 |
| Total votes | Total votes | Total votes | 164,177 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1986

1986 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Don Edwards (Incumbent) | 84,240 | 70.5 |
| | Republican | Michael R. La Crone | 31,826 | 26.6 |
| | Libertarian | Perr Cardestam | 1,797 | 1.5 |
| | Peace and Freedom | Bradley L. Mayer | 1,701 | 1.4 |
| Total votes | Total votes | Total votes | 119,564 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1988

1988 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Don Edwards (Incumbent) | 142,500 | 86.2 |
| | Libertarian | Kennita Watson | 22,801 | 13.8 |
| Total votes | Total votes | Total votes | 165,301 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1990

1990 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Don Edwards (Incumbent) | 81,875 | 62.7 |
| | Republican | Mark Patrosso | 48,747 | 37.3 |
| | No party | James (write-in) | 15 | 0.0 |
| Total votes | Total votes | Total votes | 130,637 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1992

1992 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Bill Baker | 145,702 | 52.0 |
| | Democratic | Wendell H. Williams | 134,635 | 48.0 |
| | No party | Williams (write-in) | 55 | 0.0 |
| | No party | Janloia (write-in) | 37 | 0.0 |
| Total votes | Total votes | Total votes | 280,429 | 100 |
| Turnout | Turnout | Turnout | | |
| | Republican win (new seat) | Republican win (new seat) | Republican win (new seat) | Republican win (new seat) |

### 1994

1994 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Bill Baker (Incumbent) | 138,916 | 59.30 |
| | Democratic | Ellen Schwartz | 90,523 | 38.65 |
| | Peace and Freedom | Craig W. Cooper | 4,802 | 2.05 |
| Total votes | Total votes | Total votes | 234,241 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 1996

1996 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Ellen Tauscher | 137,726 | 48.7 |
| | Republican | Bill Baker (Incumbent) | 133,633 | 47.2 |
| | Reform | John Place | 6,354 | 2.3 |
| | Natural Law | Valerie Janlois | 3,047 | 1.0 |
| | Libertarian | Gregory Lyon | 2,423 | 0.8 |
| Total votes | Total votes | Total votes | 283,183 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 1998

1998 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Ellen Tauscher (Incumbent) | 127,134 | 53.46 |
| | Republican | Charles Ball | 103,299 | 43.44 |
| | Natural Law | Valerie Janlois | 3,941 | 1.66 |
| | Reform | John Place | 3,435 | 1.44 |
| Total votes | Total votes | Total votes | 237,809 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2000

2000 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Ellen Tauscher (Incumbent) | 160,429 | 52.7 |
| | Republican | Claude B. Hutchison Jr. | 134,863 | 44.2 |
| | Natural Law | Valerie Janlois | 9,527 | 3.1 |
| Total votes | Total votes | Total votes | 304,819 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2002

2002 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Ellen Tauscher (Incumbent) | 123,481 | 75.6 |
| | Libertarian | Sonia E. Alonso Harden | 39,858 | 24.4 |
| Total votes | Total votes | Total votes | 163,339 | 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 | Ellen Tauscher (Incumbent) | 182,750 | 65.8 |
| | Republican | Jeff Ketelson | 95,349 | 34.2 |
| Total votes | Total votes | Total votes | 278,099 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2006

2006 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Ellen Tauscher (Incumbent) | 130,859 | 66.5 |
| | Republican | Darcy Linn | 66,069 | 33.5 |
| | Republican | Jeff Ketelson (write-in) | 50 | 0.0 |
| Total votes | Total votes | Total votes | 196,978 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2008

2008 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Ellen Tauscher (Incumbent) | 192,226 | 65.2 |
| | Republican | Nicholas Gerber | 91,877 | 31.1 |
| | Peace and Freedom | Eugene E. Ruyle | 11,062 | 3.7 |
| Total votes | Total votes | Total votes | 295,165 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2009 (Special)

2009 California's 10th congressional district special election :
| Party | Party | Candidate | Votes | % |
| | Democratic | John Garamendi | 72,817 | 52.85 |
| | Republican | David Harmer | 59,017 | 42.83 |
| | Green | Jeremy Cloward | 2,515 | 1.83 |
| | Peace and Freedom | Mary McIlroy | 1,846 | 1.34 |
| | American Independent | Jerome Denham | 1,591 | 1.15 |
| Total votes | Total votes | Total votes | 137,786 | 100.00 |
| Turnout | Turnout | Turnout | | 35.33 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2010

2010 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | John Garamendi (Incumbent) | 137,578 | 58.9 |
| | Republican | Gary Clift | 88,512 | 37.8 |
| | Green | Jeremy Cloward | 7,716 | 3.3 |
| Total votes | Total votes | Total votes | 233,806 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2012

2012 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Jeff Denham | 110,265 | 52.7 |
| | Democratic | José M. Hernández | 98,934 | 47.3 |
| Total votes | Total votes | Total votes | 209,199 | 100.0 |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2014

2014 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Jeff Denham (Incumbent) | 70,582 | 56% |
| | Democratic | Michael Eggman | 55,123 | 44% |
| Total votes | Total votes | Total votes | 125,705 | 100.0% |
| Turnout | Turnout | Turnout | | |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2016

2016 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Republican | Jeff Denham (Incumbent) | 124,671 | 51.7 |
| | Democratic | Michael Eggman | 116,470 | 48.3 |
| Total votes | Total votes | Total votes | 241,141 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2018

2018 United States House of Representatives elections :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Jeff Denham (Incumbent) | 45,719 | 37.5 |
| | Democratic | Josh Harder | 20,742 | 17.0 |
| | Republican | Ted D. Howze | 17,723 | 14.6 |
| | Democratic | Michael Eggman | 12,446 | 10.2 |
| | Democratic | Virginia Madueño | 11,178 | 9.2 |
| | Democratic | Sue Zwahlen | 9,945 | 8.2 |
| | Democratic | Michael J. "Mike" Barkley | 2,904 | 2.4 |
| | Democratic | Dotty Nygard (withdrawn) | 1,100 | 0.9 |
| Total votes | Total votes | Total votes | 121,757 | 100.0 |
| General election |||||
| | Democratic | Josh Harder | 115,945 | 52.3 |
| | Republican | Jeff Denham (Incumbent) | 105,955 | 47.7 |
| Total votes | Total votes | Total votes | 221,900 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 2020

2020 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Josh Harder (Incumbent) | 166,865 | 55.2 |
| | Republican | Ted Howze | 135,629 | 44.8 |
| Total votes | Total votes | Total votes | 302,494 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2022

2022 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mark DeSaulnier (Incumbent) | 198,415 | 78.9 |
| | Green | Michael Ernest Kerr | 52,965 | 21.1 |
| Total votes | Total votes | Total votes | 251,380 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2024

2024 United States House of Representatives elections :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mark DeSaulnier (Incumbent) | 242,325 | 66.5 |
| | Republican | Katherine Piccinini | 122,219 | 33.5 |
| Total votes | Total votes | Total votes | 364,544 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |