California's 12th congressional district

California's 12th congressional district is a congressional district in northern California. Lateefah Simon, a Democrat, has represented the district since January 2025. The district was represented previously by longtime congresswoman Barbara Lee, former Speaker of the House of Representatives Nancy Pelosi (who has since been redistricted to the 11th district), and former president of the United States Richard Nixon.

Currently, the 12th district is located in Alameda County and encompasses the cities of Oakland, Berkeley, Emeryville, Alameda, Albany, Piedmont, and most of San Leandro. With a Cook Partisan Voter Index rating of D+39, the 12th district is the most Democratic district in California, giving nearly 85% of its vote to Kamala Harris in the 2024 presidential election.

Before redistricting in 2023, the 12th district was within San Francisco, encompassing most of the city. The remainder of the city was included in the 14th district.

History When the district was created after the 1930 census, it was located in Los Angeles County. As California's population grew, however, the district generally was moved northward, eventually to the San Francisco peninsula.California Constitution, Article 21, Section 1(c) (congressional districts), Section 2(f) (state government districts).

Richard Nixon, who would subsequently serve as the 37th president of the United States, represented this district from 1947 to 1951, when it was located to the east of Los Angeles. Nancy Pelosi, the former speaker of the House, represented the district from 2013 to 2023, when it covered most of San Francisco. She had previously served California's 5th congressional district from 1987 to 1993 and California's 8th congressional district from 1993 to 2013 and currently represents California's 11th congressional district.

Recent election results from statewide races 2023–2033 boundaries Year Office Results2008 PresidentObama 90–10%2010 GovernorBrown 86–11% Lt. GovernorNewsom 81–13% Secretary of StateBowen 82–10% Attorney GeneralHarris 78–15% TreasurerLockyer 83–9% ControllerChiang 83–9%2012 PresidentObama 91–9%2014 GovernorBrown 92–8%2016 PresidentClinton 88–6%2018 GovernorNewsom 91–9% Attorney GeneralBecerra 91–9%2020 PresidentBiden 89–9%2022 Senate (Reg.)Padilla 91–9% GovernorNewsom 90–10% Lt. GovernorKounalakis 90–10% Secretary of StateWeber 90–10% Attorney GeneralBonta 89–11% TreasurerMa 89–11% ControllerCohen 84–16%2024 PresidentHarris 85–11% Senate (Reg.)Schiff 88–12%

Composition County Code County Seat Population1 Alameda Oakland 1,622,188 Due to the 2020 redistricting, California's 12th district has effectively been shifted to the former geography of the 13th district. It encompasses the coastal section of Alameda County, and is anchored by Oakland. The district also includes the cities of Alameda, Albany, Berkeley, Emeryville, Piedmont, and San Leandro. Technically, the westernmost tip of Alameda Island is part of the City and County of San Francisco, but it is uninhabited.

This district borders the 13th district, and Alameda County is partitioned between them by Grant Ave, Union Pacific, Lewelling Blvd, Wicks Blvd, Manor Blvd, Juniper St, Dayton Ave, Padre Ave, Fargo Ave, Edgemoor St, Trojan Ave, Beatty St, Fleming St, Highway 880, Floresta Blvd, Halcyon Dr, Hesperian Blvd, Thornally Dr, Highway 185, 150th Ave, Highway 580, Benedict Dr, San Leandro Creek, and Lake Chabot Regional Park.

Cities Oakland – 440,646 Berkeley – 124,321 San Leandro – 91,008 Alameda – 78,280 Albany – 20,271 Emeryville – 12,905 Piedmont – 11,270

List of members representing the district Representative Party Dates Congress(es) Electoral history CountiesMartis, Kenneth C., The Historical Atlas of United States Congressional Districts, 1789–1983. New York: Macmillan Publishing, 1982.Martis, Kenneth C., The Historical Atlas of Political Parties in the United States Congress, 1789–1989. New York: Macmillan Publishing, 1989. District created March 4, 1933 John H. Hoeppel Democratic March 4, 1933 –January 3, 1937 Elected in 1932.Re-elected in 1934.Lost renomination. 1933–1953:Eastern Los Angeles (Pasadena, Pomona, Whittier) Jerry Voorhis Democratic January 3, 1937 –January 3, 1947 Elected in 1936.Re-elected in 1938.Re-elected in 1940.Re-elected in 1942.Re-elected in 1944.Lost re-election. Richard Nixon Republican January 3, 1947 –November 30, 1950 Elected in 1946.Re-elected in 1948.Retired to run for U.S. Senator.Resigned when appointed U.S. Senator. Vacant November 30, 1950 –January 3, 1951 Patrick J. Hillings Republican January 3, 1951 –January 3, 1953 Elected in 1950.Redistricted to the . Allan O. Hunter Republican January 3, 1953 –January 3, 1955 Redistricted from the and re-elected in 1952.Lost re-election. 1953–1963:Fresno, Madera, Merced B. F. Sisk Democratic January 3, 1955 –January 3, 1963 Elected in 1954.Re-elected in 1956.Redistricted to the . Burt Talcott Republican January 3, 1963 –January 3, 1975 Elected in 1962.Re-elected in 1964.Re-elected in 1966.Re-elected in 1968.Re-elected in 1970.Re-elected in 1972.Redistricted to the . 1963–1967:Monterey, San Benito, San Luis Obispo, Santa Cruz 1967–1973:Kings, Monterey, San Luis Obispo, Santa Cruz 1973–1975:Monterey, San Benito, northwestern San Luis Obispo, southern Santa Clara, Santa Cruz Pete McCloskey Republican January 3, 1975 –January 3, 1983 Redistricted from the and re-elected in 1974.Re-elected in 1976.Re-elected in 1978.Re-elected in 1980.Retired to run for U.S. Senator. 1975–1983:Southern San Mateo, northern Santa Clara Ed Zschau Republican January 3, 1983 –January 3, 1987 Elected in 1982.Re-elected in 1984.Retired to run for U.S. Senator. 1983–1993:Southern San Mateo, Santa Clara, northern Santa Cruz Ernie Konnyu Republican January 3, 1987 –January 3, 1989 Elected in 1986.Lost renomination. Tom Campbell Republican January 3, 1989 –January 3, 1993 Elected in 1988.Re-elected in 1990.Retired to run for U.S. Senator. Tom Lantos Democratic January 3, 1993 –February 11, 2008 Redistricted from the and re-elected in 1992.Re-elected in 1994.Re-elected in 1996.Re-elected in 1998.Re-elected in 2000.Re-elected in 2002.Re-elected in 2004.Re-elected in 2006.Announced retirement, then died. 1993–2003:Southwestern San Francisco, northern San Mateo 2003–2013:Southwestern San Francisco, northern San Mateo Vacant February 11, 2008 –April 8, 2008 Jackie Speier Democratic April 8, 2008 –January 3, 2013 Elected to finish Lantos's term.Re-elected in 2008.Re-elected in 2010.Redistricted to the . Nancy Pelosi Democratic January 3, 2013 –January 3, 2023 Redistricted from the and re-elected in 2012.Re-elected in 2014.Re-elected in 2016.Re-elected in 2018.Re-elected in 2020.Redistricted to the . 2013–2023:Most of San Francisco Barbara Lee Democratic January 3, 2023 – January 3, 2025 Redistricted from the and re-elected in 2022.Retired to run for U.S. senator. 2023–presentnorthwestern portion of Alameda CountyLateefah Simon DemocraticJanuary 3, 2025 – presentElected in 2024.

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California's 12th congressional district

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