U.S. House district for California
California's 10th congressional district Interactive map of district boundaries since 2023 (Used in the
2022 elections )
Representative Population (2024) 773,816 Median household $151,546[ 1] Ethnicity Cook PVI D+18[ 2]
California's 10th congressional district is acongressional district in theSan Francisco Bay Area U.S. state ofCalifornia . It is currently represented byDemocrat Mark DeSaulnier .
Since redistricting in 2022, the 10th district is mostly inContra Costa County with a small portion inAlameda County . It includes the cities ofConcord ,Walnut Creek ,Danville ,San Ramon ,Brentwood , and southernAntioch in Contra Costa County, and easternDublin in Alameda County. It was essentially the successor of the old11th district .[ 3]
The district previously included all ofStanislaus County and part ofSan Joaquin County . It was centered onModesto . Cities in the district includedOakdale ,Manteca , Modesto,Tracy , andTurlock .[ 4]
Prior to redistricting by theCalifornia Citizens Redistricting Commission going into effect in 2012, the 10th district stretched fromLivermore toDixon and the outskirts ofVacaville . It consisted of portions ofAlameda ,Contra Costa ,Sacramento , andSolano Counties.
District borders, 2002-2012. Following redistricting in 1992, the 10th district was based in theEast Bay , and included parts ofAlameda andContra Costa counties. It received national attention in 1996 whenDemocrat Ellen Tauscher defeated incumbentRepublican Bill Baker in what was considered an upset.[ 5]
In the 2002 redistricting of California, all seats were made safe[ 6] Solano County , southwesternSacramento County , easternContra Costa County andEl Cerrito in western Contra Costa County. Although much of the suburbanTri-Valley region was shifted to the11th congressional district , the city ofLivermore remained in the 10th at Tauscher's request (as a member of theU.S. House Committee on Energy and Commerce , she had some oversight responsibilities over theU.S. Department of Energy , and hence indirectly ofLawrence Livermore National Laboratory ).
On June 26, 2009, Tauscher resigned her seat to be sworn in asUndersecretary of State for Arms Control and International Security .[ 7] [ 8] [ 9] special election held on November 3, 2009, formerDemocratic Lieutenant Governor John Garamendi won the seat overRepublican David Harmer 53.0% to 42.7%. Immediately following redistricting, Garamendi successfully ran for re-election inCalifornia's 3rd congressional district , which shares many municipalities with the 2002 version of the 10th district (e.g.Vacaville andFairfield ), but lies significantly northwest of the current 10th district.
The 10th congressional district starting withthe election of 2012 and lasting through the election of 2020 included all ofStanislaus County (includingCeres ,Oakdale ,Modesto ,Riverbank , andTurlock ) and the southern portion ofSan Joaquin County (includingTracy andManteca ).[ 4]
This went into effect in 2012, as the result of redistricting by theCalifornia Citizens Redistricting Commission . This version of the 10th included much of the core of the old18th district (Modesto ,Ceres , and the southwestern half of Stanislaus County), though the 18th also included a substantial portion ofStockton . It also shares much of the northwestern portion of the old19th district (Turlock ,Riverbank ,Oakdale , and the rest of northeastern Stanislaus County).
RepublicanJeff Denham transferred from the prior 19th district to the newer 10th. He held it for three terms until being defeated in 2018 by DemocratJosh Harder , whowon reelection in 2020 .
The 10th district was redrawn in time forthe 2022 election , being divided up betweenCalifornia's 5th congressional district (which now includes eastern portions ofModesto and eastern portions ofTurlock ),California's 9th congressional district (which is centered onStockton, California and includesTracy ), andCalifornia's 13th congressional district (which includes westernModesto and westernTurlock ) .[ 10] Josh Harder was reelected and moved to the new version ofCalifornia's 9th congressional district . The district has been represented since Jan 3, 2023 byMark DeSaulnier .
Voter registration statistics [ edit ] 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[ 11] 127,878 117,900 10,011 959 2,484 70,251
Recent election results from statewide races [ edit ] Under the 2020 redistricting, California's 10th congressional district is located in theSan Francisco Bay Area , encompassing most ofContra Costa County, and part ofAlameda County. The area in Contra Costa County includes the south sides of the cities ofAntioch andMartinez ; the cities ofConcord ,Brentwood ,Oakley ,Pleasant Hill ,Clayton ,Walnut Creek ,Lafayette ,Orinda , andSan Ramon ; the towns ofDanville andMoraga ; and the census-designated placesNorris 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 , andBethel Island . The area in Alameda County includes the eastern portion of the city ofDublin .
Contra Costa County is split between this district, the8th district , and the9th 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 the12th ,14th , and17th 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.
[ edit ] Concord – 125,410Antioch – 115,291San Ramon – 84,605Dublin – 72,589Walnut Creek – 70,127Brentwood – 64,292Danville – 43,582Oakley – 43,357Martinez – 37,287Pleasant Hill – 34,613Lafayette – 25,391Orinda – 19,514Moraga – 16,870Alamo – 15,314Clayton – 11,070[ edit ] List of members representing the district [ edit ] Member Party Dates Cong Electoral history Counties District created March 4, 1913 William Stephens (Los Angeles ) Progressive March 4, 1913 – 63rd 64th Redistricted from the7th district re-elected in 1912 .Re-elected in 1914 .Lieutenant Governor of California . 1913–1933 Los Angeles (Los Angeles )Vacant July 22, 1916 – 64th Henry S. Benedict (Los Angeles ) Republican November 7, 1916 – Elected to finish Stephens's term .Progressive but withdrew.Henry Z. Osborne (Los Angeles ) Republican March 4, 1917 – 65th 66th 67th Elected in 1916 .Re-elected in 1918 .Re-elected in 1920 .Re-elected in 1922 but died.Vacant February 8, 1923 – 67th 68th John D. Fredericks (Los Angeles ) Republican May 1, 1923 – 68th 69th Elected to finish Osborne's term .Re-elected in 1924 .Joe Crail (Los Angeles ) Republican March 4, 1927 – 70th 71st 72nd Elected in 1926 .Re-elected in 1928 .Re-elected in 1930 .Henry E. Stubbs (Santa Maria ) Democratic March 4, 1933 – 73rd 74th 75th Elected in 1932 .Re-elected in 1934 .Re-elected in 1936 .1933–1943 Kern ,San Luis Obispo ,Santa Barbara ,Tulare ,Ventura Vacant February 28, 1937 – 75th Alfred J. Elliott (Tulare ) Democratic May 4, 1937 – 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 .1943–1953 Kern ,Kings ,Tulare Thomas H. Werdel (Bakersfield ) Republican January 3, 1949 – 81st 82nd Elected in 1948 .Re-elected in 1950 .14th district Charles Gubser (Gilroy ) Republican January 3, 1953 – 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 .1953–1963 San Benito ,Santa Clara ,Santa Cruz 1963–1967 San Benito , westernSanta Clara 1967–1973 Santa Clara 1973–1975 Santa Clara Vacant December 31, 1974 – 93rd Don Edwards (San Jose ) Democratic January 3, 1975 – 94th 95th 96th 97th 98th 99th 100th 101st 102nd Redistricted from the9th district 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 .16th district 1975–1983 Alameda , northernSanta Clara 1983–1993 Alameda ,Santa Clara (easternSan Jose )Bill Baker (Walnut Creek ) Republican January 3, 1993 – 103rd 104th Elected in 1992 .Re-elected in 1994 .1993–2003 Alameda , easternContra Costa Ellen Tauscher (Alamo ) Democratic January 3, 1997 – 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 .Undersecretary of State for Arms Control and International Security .2003–2013 Alameda , most ofContra Costa , southwestSacramento , most ofSolano Vacant June 26, 2009 – 111th John Garamendi (Walnut Creek ) Democratic November 3, 2009 – 111th 112th Elected to finish Tauscher's term .Re-elected in 2010 .3rd district Jeff Denham (Turlock ) Republican January 3, 2013 – 113th 114th 115th Redistricted from the19th district re-elected in 2012 .Re-elected in 2014 .Re-elected in 2016 . 2013–2023 Central Valley includingModesto andTracy Josh Harder (Turlock ) Democratic January 3, 2019 – 116th 117th Elected in 2018 .Re-elected in 2020 .9th district Mark DeSaulnier (Concord ) Democratic January 3, 2023 – 118th 119th Redistricted from the11th district re-elected in 2022 .Re-elected in 2024 . 2023–present San Francisco Bay Area , including parts ofStanislaus andSan Joaquin
Election results for representatives [ edit ] Republican John D. Fredericks won the special election to replace fellow RepublicanHenry Z. Osborne , who died in office.[ 19]
Democrat Alfred J. Elliott won the special election to replace fellow DemocratHenry E. Stubbs , who died in office.[ 28]
2018 United States House of Representatives elections Primary election 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 121,757 100.0 General election Democratic Josh Harder 115,945 52.3 Republican Jeff Denham (Incumbent)105,955 47.7 Total votes 221,900 100.0 Democratic gain fromRepublican
^ Center for New Media & Promotion (CNMP), US Census Bureau."My Congressional District" .www.census.gov . ^ "2025 Cook PVI℠: District Map and List (119th Congress)" .Cook Political Report . RetrievedApril 5, 2025 .^ "CA 2022 Congressional" .Dave's Redistricting . January 4, 2022. RetrievedNovember 11, 2022 .^a b "Maps: Final Congressional Districts" . Citizens Redistricting Commission. Archived fromthe original on March 10, 2013. RetrievedFebruary 24, 2013 .^ "Ellen Tauscher is the Grand Dame of CD-10" . May 18, 2015. Archived fromthe original on May 18, 2015.^ SeePolitics of California#Bi-partisan gerrymandering ^ "Tauscher accepts State Department post" . March 18, 2009.^ "Capitol Alert: Tauscher to take Obama post, opening up House seat" . Archived fromthe original on April 10, 2009. RetrievedJune 14, 2009 .^ Stannard, Matthew (June 25, 2009)."Rep. Tauscher new U.S. arms control chief" .San Francisco Chronicle . RetrievedJune 25, 2009 . ^ "Map Viewer" .We Draw the Lines CA . RetrievedJanuary 22, 2022 .^ California Secretary of State. Registration by US Congressional District, Report of Registration-May 21, 2018.https://www.sos.ca.gov/elections/report-registration/15day-primary-2018/ ^ "CA 2022 Congressional" .davesredistricting.org . RetrievedOctober 7, 2025 .^ "Supplement to Statement of Vote" (PDF) . November 8, 2022.Archived (PDF) from the original on January 8, 2025. RetrievedJanuary 21, 2025 .^ "Supplement to Statement of Vote" (PDF) . November 5, 2024.Archived (PDF) from the original on April 9, 2025. RetrievedApril 5, 2025 .^ "California FIPS Codes" .National Weather Service . RetrievedMarch 11, 2025 .^ "CA District 10 - Special Election" .Our Campaigns . RetrievedJanuary 23, 2022 .^ "1920 election results" (PDF) .^ "1922 election results" (PDF) .^ "JoinCalifornia - 05-01-1923 Election" .www.joincalifornia.com .^ "CA District 10 - Special Election" .Our Campaigns . RetrievedJanuary 23, 2022 .^ "1924 election results" (PDF) .^ "1926 election results" (PDF) .^ "1928 election results" (PDF) .^ "1930 election results" (PDF) .^ "1932 election results" (PDF) .^ "1934 election results" (PDF) .^ "1936 election results" (PDF) .^ "JoinCalifornia - 05-04-1937 Election" .www.joincalifornia.com .^ "CA District 10 - Special Election" .Our Campaigns . RetrievedJanuary 23, 2022 .^ "1938 election results" (PDF) .^ "1940 election results" (PDF) .^ "1942 election results" (PDF) .^ "1944 election results" (PDF) .^ "1946 election results" (PDF) .^ "1948 election results" (PDF) .^ "1950 election results" (PDF) .^ "1952 election results" (PDF) .^ "1954 election results" (PDF) .^ "1956 election results" (PDF) .^ "1958 election results" (PDF) .^ "1960 election results" (PDF) .^ "1962 election results" (PDF) .^ "1964 election results" (PDF) .^ "1966 election results" (PDF) .^ "1968 election results" (PDF) .^ "1970 election results" (PDF) .^ "1972 election results" (PDF) .^ "1974 election results" (PDF) .^ "1976 election results" (PDF) .^ "1978 election results" (PDF) .^ "1980 election results" (PDF) .^ "1982 election results" (PDF) .^ "1984 election results" (PDF) .^ "1986 election results" (PDF) .^ "1988 election results" (PDF) .^ "1990 election results" (PDF) .^ "1992 election results" (PDF) .^ "1994 election results" (PDF) .^ "1996 election results" (PDF) .^ "1998 election results" (PDF) .^ "2000 election results" (PDF) .^ "2002 general election results" (PDF) . Archived fromthe original (PDF) on February 3, 2009.^ "2004 general election results" (PDF) .[permanent dead link ^ "2006 general election results" (PDF) . Archived fromthe original (PDF) on November 27, 2008.^ "2008 general election results" (PDF) . Archived fromthe original (PDF) on December 21, 2008.^ "Official Canvass: United States Representative 10th Congressional District Special General Election, November 3, 2009" (PDF) .Secretary of State of California . November 16, 2009. Archived fromthe original (PDF) on November 19, 2009. RetrievedNovember 16, 2009 .^ "2010 general election results" (PDF) . Archived fromthe original (PDF) on May 20, 2011.^a b "2012 general election results" (PDF) . Archived fromthe original (PDF) on October 19, 2013.^ "Election 2020 | California Secretary of State" .www.sos.ca.gov .
The at-large seats only existed from 1850 to 1865 and from 1883 to 1885. See also California's past and presentrepresentatives ,senators , anddelegations
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