California's 12th Congressional District

California's 12th Congressional District is represented by Lateefah Simon (Democrat), who has held the seat since 2025. Simon has an overall VoteSee report card grade of D, voted in 98% of roll-call votes on bills this Congress, and votes with the Democratic majority 96% of the time. The district includes Oakland, Berkeley, and Alameda. It takes in all or part of 2 counties, and 100% of residents live in Alameda County. About 748,000 people live in the district, and the median household income is $108,648.

Current Representative

Lateefah Simon (Democrat) has represented California's 12th Congressional District since 2025.

VoteSee report card grade: D
Attendance in the 119th Congress: 98% of roll-call votes on bills
Votes with the Democrat majority: 96%

See Lateefah Simon's full voting record and issue positions →

2026 Election

U.S. House: California 12th District

Winner: Lateefah Simon.

Incumbent Lateefah Simon is running for re-election. 2 candidates were on the Nov 3, 2026 ballot.

California uses a top-two primary, so the two November candidates can be from the same party.

Lateefah Simon (Democratic), incumbent: raised $1.7M, $726K cash on hand; VoteSee report card D; 98% attendance; votes with the Democratic majority 96% of the time
Jamie Joyce (Democratic): raised $70K, $5K cash on hand

Polls: No public polls

See the full 2026 race →

District Demographics

Population: 748,393
Median household income: $108,648
Median age: 38
Median home value: $1,019,900
Bachelor's degree or higher: 54.1%

Source: American Community Survey 2020–2024 5-year estimates, 119th Congress boundaries.

How Simon Voted Recently

Yea on American Enrichment Deployment Act (Nov 9, 2026) — Passed
Yea on Nuclear REFUEL (Recycling Efficient Fuels Utilizing Expedited Licensing) Act (Nov 9, 2026) — Passed
Yea on Retire through Ownership Act (Sep 16, 2026) — Passed
Yea on Water Resources Development Act of 2026 (Sep 16, 2026) — Passed
Yea on Ratepayer Protection Act (Sep 16, 2026) — Passed

Breaks with the Democrat majority

Nay on National Fraud Enforcement Division Act of 2026 (Sep 16, 2026) — Passed
Nay on Continuing Appropriations Act, 2027 (Sep 1, 2026) — Passed
No on National Defense Authorization Act for Fiscal Year 2027 (Jul 21, 2026) — Agreed to

Who Held This Seat Before

Members of Congress who previously represented California's 12th Congressional District. District lines are redrawn after each census, so earlier members may have represented a different area under this number.

Barbara Lee — Democrat (2023–2025)
Nancy Pelosi — Democrat (2013–2023)
Jackie Speier — Democrat (2008–2013)
Tom Lantos — Democrat (1993–2008)
Tom Campbell — Republican (1989–1993)
Ernest Konnyu — Republican (1987–1989)
Edwin Zschau — Republican (1983–1987)
Pete McCloskey — Republican (1975–1983)
Burt Talcott — Republican (1963–1975)
Bernice Sisk — Democrat (1955–1963)
Allan Hunter — Republican (1953–1955)
Patrick Hillings — Republican (1951–1953)

Where the District Is

California's 12th Congressional District covers 93 square miles of land. Boundaries are for the current (119th) Congress.

Counties

Alameda County (part): 100% of residents
San Francisco County (part): under 1% of residents

Largest communities

Oakland
Berkeley
Alameda
San Leandro (part)
Albany
Emeryville
Piedmont