- Lead
- 19,449
- Total
- 146,176
- vs nation
- D+14.8
California 13th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 50,624
- Total
- 166,024
- vs nation
- D+26.0
- Lead
- 42,675
- Total
- 130,878
- vs nation
- D+30.5
- Lead
- 39,023
- Total
- 118,474
- vs nation
- D+29.1
- Lead
- 36,662
- Total
- 120,219
- vs nation
- D+23.2
- Lead
- 14,418
- Total
- 104,417
- vs nation
- D+16.3
- Lead
- 17,809
- Total
- 93,591
- vs nation
- D+18.5
- Lead
- 16,683
- Total
- 81,149
- vs nation
- D+12.0
Key facts
- 2024 presidential margin
- D+13.3MIT Election Lab
- Population
- 487,8722024 5-year
- Population density
- 1,032 / sq mi2024 5-year · TIGER/Line
- Land area
- 473 sq miTIGER/Line
- Median household income
- $90,7062024 5-year
- White (non-Hispanic)
- 20.0%2024 5-year
- Black
- 10.0%2024 5-year
- Hispanic / Latino
- 42.9%2024 5-year
- Peak Democratic margin
- D+62.2 in 1936MIT Election Lab
- Peak Republican margin
- R+26.7 in 1924MIT Election Lab
- Most similar
- Assembly District 50, CA · twin score 93.1
presidential history
Party record book
California 13th State House District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 (partial returns from 1876) · 38 presidential cycles · 38 with a vote-share denominator · 34 with a national benchmark
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Franklin D. Roosevelt1936
80.5%
19,716 votes · D+62.2 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1932 · 72.0%
Republican
Warren G. Harding1920
50.4%
5,210 votes · R+6.8 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 49.4%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
106,505votes
64.2% of the vote · D+30.5 · modeled estimate
Runner-up · Hillary Clinton, 2016 · 81,825 votes
Republican
Donald Trump2024
60,887votes
41.7% of the vote · D+13.3 · modeled estimate
Runner-up · Donald Trump, 2020 · 55,881 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
Woodrow Wilson1912
+40.2pts D vs U.S.
Place D+59.8 · U.S. D+19.5 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · +37.9 pts
Republican
Calvin Coolidge1924
+1.5pts R vs U.S.
Place R+26.7 · U.S. R+25.2 · a third-party candidate carried the Place · modeled estimate
Runner-up · Ronald Reagan, 1980 · −9.2 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
Assembly District 13 covers densely populated communities in the East Bay, where a D+13.3 presidential margin in 2024 reflects a heavily urban, diverse electorate that has voted reliably blue by wide margins for over a decade.
Across the recorded series it reached a Democratic high of 62.2 points in 1936 and a Republican high of 26.7 points in 1924. Between 2020 and 2024 the district moved 17.2 points toward the Republican candidate; the 2024 margin was 13.3 points.
A population of 487,872, a 20% non-Hispanic-white share, and a median household income of $90,706 describe the district. The district's voting pattern over the last decade is most similar to that of Assembly District 50 and Assembly District 31.
The state-house districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
California 13th State House District. Akashic. https://akashic.app/sld-lower/06013/. Accessed May 20, 2026. License: CC BY 4.0.