California's 10th congressional district is a

congressional district Congressional districts, also known as electoral districts in other nations, are divisions of a larger administrative region that represent the population of a region in the larger congressional body. Countries with congressional districts includ ...

in the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

. Currently, the 10th district encompasses parts of the eastern

San Francisco Bay Area The San Francisco Bay Area, commonly known as the Bay Area, is a List of regions of California, region of California surrounding and including San Francisco Bay, and anchored by the cities of Oakland, San Francisco, and San Jose, California, S ...

. It is currently represented by Democrat Mark DeSaulnier. The district previously included all of Stanislaus County and part of

San Joaquin County San Joaquin County ( ; , meaning " St. Joachim"), officially the County of San Joaquin, is a county located in the U.S. state of California. As of the 2020 United States census, the population was 779,233. The county seat is Stockton. San Jo ...

. It was centered on

Modesto Modesto ( ; ) is the county seat and largest city of Stanislaus County, California, United States. With a population of 218,069 according to 2022 U.S. Census Bureau estimates, it is the 19th-most populous city in California. Modesto is locate ...

. Cities in the district included Oakdale, Manteca, Modesto, Tracy, and Turlock. Redistricting before the 2022 elections moved the district to the

. It includes the cities of Concord, Walnut Creek, Danville, San Ramon, Brentwood, and southern

Antioch Antioch on the Orontes (; , ) "Antioch on Daphne"; or "Antioch the Great"; ; ; ; ; ; ; . was a Hellenistic Greek city founded by Seleucus I Nicator in 300 BC. One of the most important Greek cities of the Hellenistic period, it served as ...

Contra Costa County Contra Costa County (; ''Contra Costa'', Spanish language, Spanish for 'Opposite Coast') is a U.S. county, county located in the U.S. state of California, in the East Bay of the San Francisco Bay Area. As of the 2020 United States census, the ...

, and eastern

Dublin Dublin is the capital and largest city of Republic of Ireland, Ireland. Situated on Dublin Bay at the mouth of the River Liffey, it is in the Provinces of Ireland, province of Leinster, and is bordered on the south by the Dublin Mountains, pa ...

Alameda County Alameda County ( ) is a county located in the U.S. state of California. As of the 2020 census, the population was 1,682,353, making it the 7th-most populous county in the state and 21st most populous nationally. The county seat is Oakland. A ...

. It was essentially the successor of the old 11th district.

History

Until 2012

Prior to redistricting by the

California Citizens Redistricting Commission The California Citizens Redistricting Commission is the redistricting commission for the California, State of California responsible for determining the boundaries of districts for the California State Senate, State Senate, California State Asse ...

going into effect in 2012, the 10th district stretched from Livermore to Dixon and the outskirts of

Vacaville Vacaville is a city located in Solano County, California, United States. It is located from Sacramento, California, Sacramento and from San Francisco, it is on the edge of the Sacramento Valley in Northern California. The city was founded in ...

. It consisted of portions of Alameda, Contra Costa,

Sacramento Sacramento ( or ; ; ) is the capital city of the U.S. state of California and the seat of Sacramento County. Located at the confluence of the Sacramento and American Rivers in Northern California's Sacramento Valley, Sacramento's 2020 p ...

, and Solano Counties. Ca10_109

Following redistricting in 1992, the 10th district was based in the

East Bay The East Bay is the eastern region of the San Francisco Bay Area and includes cities along the eastern shores of San Francisco Bay and San Pablo Bay. The region has grown to include inland communities in Alameda and Contra Costa counties. Wi ...

, and included parts of Alameda and Contra Costa counties. It received national attention in 1996 when Democrat

Ellen Tauscher Ellen O'Kane Tauscher (November 15, 1951 – April 29, 2019) was an American businesswoman, diplomat, and Democratic Party politician who was the U.S. representative for California's 10th congressional district from 1997 to 2009. From 2009 to 20 ...

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 Sacramento County () is a county located in the U.S. state of California. As of the 2020 United States census, the population was 1,585,055. Its county seat is Sacramento, which has been the state capital of California since 1854. Sacrament ...

, eastern

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 The United States Department of Energy (DOE) is an executive department of the U.S. federal government that oversees U.S. national energy policy and energy production, the research and development of nuclear power, the military's nuclear we ...

, and hence indirectly of

Lawrence Livermore National Laboratory Lawrence Livermore National Laboratory (LLNL) is a Federally funded research and development centers, federally funded research and development center in Livermore, California, United States. Originally established in 1952, the laboratory now i ...

). 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 A by-election, also known as a special election in the United States and the Philippines, or a bypoll in India, is an election used to fill an office that has become vacant between general elections. A vacancy may arise as a result of an incumben ...

held on November 3, 2009, former Democratic

Lieutenant Governor A lieutenant governor, lieutenant-governor, or vice governor is a high officer of state, whose precise role and rank vary by jurisdiction. Often a lieutenant governor is the deputy, or lieutenant, to or ranked under a governor — a "second-in-comm ...

John Garamendi John Raymond Garamendi ( ; born January 24, 1945) is an American businessman, politician and member of the Democratic Party who has represented areas of Northern California between San Francisco and Sacramento, including the cities of Fairfiel ...

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 California's 3rd congressional district is a List of United States congressional districts, U.S. congressional district in California. It includes the northern Sierra Nevada and northeastern suburbs of Sacramento, California, Sacramento, stretc ...

, which shares many municipalities with the 2002 version of the 10th district (e.g.

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,

, Riverbank, and Turlock) and the southern portion of

(including Tracy and Manteca). This went into effect in 2012, as the result of redistricting by the

. This version of the 10th included much of the core of the old 18th district (

, 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 Jeffrey John Denham (born July 29, 1967) is an American politician, United States Air Force veteran, and businessman. A member of the Republican Party, he served as the U.S. representative for from 2013 to 2019. Denham first won election to t ...

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 Joshua Keck Harder (born August 1, 1986) is an American politician and venture capital investor who has served as the United States House of Representatives, U.S. representative for California's 9th congressional district since 2023, after serv ...

, 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 California's 5th congressional district is a List of United States congressional districts, U.S. congressional district in California. The district is located in the northern San Joaquin Valley and central Sierra Nevada. The district includes ...

(which now includes eastern portions of

and eastern portions of Turlock),

California's 9th congressional district California's 9th congressional district is a congressional district in the U.S. state of California. Josh Harder, a Democratic Party (United States), Democrat, has represented the district since January 2023. Prior to redistricting by the Cali ...

(which is centered on

Stockton, California Stockton is a city in and the county seat of San Joaquin County, California, San Joaquin County in the Central Valley (California), Central Valley of the U.S. state of California. It is the most populous city in the county, the List of municipal ...

and includes Tracy), and

California's 13th congressional district California's 13th congressional district is a California's congressional districts, congressional district in the U.S. state of California. Adam Gray, a Democratic Party (United States), Democrat, has represented this district since January 20 ...

(which includes western

and western Turlock) . The 2022 10th district incumbent

was reelected and moved to the new version of

. 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.

Recent election results from statewide races

Composition

Under the 2020 redistricting, California's 10th congressional district is located in the

, 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

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 The Battle of the Alamo (February 23 – March 6, 1836) was a pivotal event and military engagement in the Texas Revolution. Following a 13-day siege, Mexican troops under President General Antonio López de Santa Anna reclaimed the Alam ...

, 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

. 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 *

– 115,291 * San Ramon – 84,605 *

– 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 *

– 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

Election results for representatives

1912

1914

1916 (Special)

1916

1918

1920

1922

1923 (Special)

Republican John D. Fredericks won the special election to replace fellow Republican Henry Z. Osborne, who died in office.

1924

1926

1928

1930

1932

1934

1936

1937 (Special)

Democrat Alfred J. Elliott won the special election to replace fellow Democrat Henry E. Stubbs, who died in office.

1938

1940

1942

1944

1946

1948

1950

1952

1954

1956

1958

1960

1962

1964

1966

1968

1970

1972

1974

1976

1978

1980

1982

1984

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

2008

2009 (Special)

2010

2012

2014

2016

2018

2020

2022

2024

References

External links

* GovTrack.us
California's 10th congressional district

(out of date)
California Voter Foundation map - CD10
(out of date) {{DEFAULTSORT:California's 10th Congressional District 10 Government of San Joaquin County, California Government of Stanislaus County, California San Joaquin Valley Ceres, California Modesto, California Oakdale, California Tracy, California Turlock, California Constituencies established in 1913 1913 establishments in California