- Lead
- 28,708
- Total
- 295,109
- vs nation
- D+11.2
California 27th Congressional District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 64,057
- Total
- 329,921
- vs nation
- D+15.0
- Lead
- 47,663
- Total
- 258,569
- vs nation
- D+16.3
- Lead
- 18,597
- Total
- 248,275
- vs nation
- D+3.6
- Lead
- 14,772
- Total
- 260,664
- vs nation
- R+1.6
- Lead
- 23,578
- Total
- 251,152
- vs nation
- R+6.9
- Lead
- 9,507
- Total
- 218,882
- vs nation
- R+4.9
- Lead
- 9,814
- Total
- 196,974
- vs nation
- R+13.5
Key facts
- 2024 presidential margin
- D+9.7MIT Election Lab
- Population
- 759,6502024 5-year
- Population density
- 933 / sq mi2024 5-year · TIGER/Line
- Land area
- 814 sq miTIGER/Line
- Median household income
- $101,3142024 5-year
- White (non-Hispanic)
- 31.1%2024 5-year
- Black
- 9.9%2024 5-year
- Hispanic / Latino
- 45.5%2024 5-year
- Peak Democratic margin
- D+23.1 in 1912MIT Election Lab
- Peak Republican margin
- R+72.9 in 1924MIT Election Lab
- Most similar
- Congressional District 42, CA · twin score 91.2
presidential history
Party record book
California 27th Congressional 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
Joe Biden2020
58.6%
193,379 votes · D+19.4 · modeled estimate
Runner-up · Hillary Clinton, 2016 · 56.0%
Republican
Herbert Hoover1928
82.8%
63,842 votes · R+66.8 · modeled estimate
Runner-up · Warren G. Harding, 1920 · 82.3%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
193,379votes
58.6% of the vote · D+19.4 · modeled estimate
Runner-up · Kamala Harris, 2024 · 157,434 votes
Republican
Richard Nixon1972
195,753votes
71.9% of the vote · R+46.2 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 179,323 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
Hillary Clinton2016
+16.3pts D vs U.S.
Place D+18.4 · U.S. D+2.1 · modeled estimate
Runner-up · Joe Biden, 2020 · +15.0 pts
Republican
Theodore Roosevelt1904
+52.1pts R vs U.S.
Place R+71.8 · U.S. R+19.7 · modeled estimate
Runner-up · William H. Taft, 1908 · +50.4 pts
Current officeholders
Federal officeholders only. State and local officeholders are planned for the next data pass.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each result reflects the U.S. House district as it was drawn for that election; redistricting has redrawn these lines over time, so they can differ from the current 120th-Congress district shown on the map above.
Anchored in the San Gabriel Valley east of Los Angeles, CA-27 returned a D+9.7 presidential margin in 2024, reflecting a heavily Asian American and Latino electorate that has shifted decisively toward Democratic candidates over the past decade.
Across the recorded series it reached a Democratic high of 23.1 points in 1912 and a Republican high of 72.9 points in 1924. Between 2020 and 2024 the district moved 9.7 points toward the Republican candidate; the 2024 margin was 9.7 points.
A population of 759,650, a 31% non-Hispanic-white share, and a median household income of $101,314 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 42 and Congressional District 31.
The congressional 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 27th Congressional District. Akashic. https://akashic.app/cd/0627/. Accessed May 20, 2026. License: CC BY 4.0.