California 40th Congressional District
Akashic| Year | Margin (D minus R) |
|---|---|
| 2008 | −14.5% |
| 2012 | −22.0% |
| 2016 | −13.7% |
| 2020 | −7.7% |
| 2024 | −12.2% |
Federal officeholders only. State and local officeholders are planned for the next data pass.
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.
| Year | District | Won | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | 40 | R | 44.7%171,637 | 55.3%211,998 | 383,635 |
| 2022 | 40 | R | 43.2%122,722 | 56.8%161,589 | 284,311 |
| 2020 | 40 | D | 72.7%135,572 | 27.3%50,809 | 186,381 |
| 2018 | 40 | D | 77.3%93,938 | 0.0%0 | 121,449 |
| 2016 | 40 | D | 71.4%106,554 | 0.0%0 | 149,297 |
| 2014 | 40 | D | 100.0%49,379 | 0.0%0 | 49,379 |
| 2012 | 40 | D | 100.0%125,553 | 0.0%0 | 125,553 |
| 2010 | 40 | R | 33.2%59,400 | 66.8%119,455 | 178,855 |
| 2008 | 40 | R | 37.5%86,772 | 62.5%144,923 | 231,695 |
| 2006 | 40 | R | 30.7%46,418 | 66.8%100,995 | 151,289 |
| 2004 | 40 | R | 32.1%69,684 | 67.9%147,617 | 217,301 |
| 2002 | 40 | R | 29.5%40,265 | 67.6%92,422 | 136,642 |
| 2000 | 40 | R | 0.0%0 | 79.9%151,069 | 189,022 |
| 1998 | 40 | R | 31.9%47,897 | 64.9%97,406 | 150,125 |
| 1996 | 40 | R | 29.0%44,102 | 64.9%98,821 | 152,261 |
| 1994 | 40 | R | 29.3%48,003 | 70.7%115,728 | 163,731 |
| 1992 | 40 | R | 31.1%63,881 | 63.1%129,563 | 205,283 |
| 1990 | 40 | R | 32.4%68,087 | 67.6%142,299 | 210,386 |
| 1988 | 40 | R | 29.9%80,782 | 67.0%181,269 | 270,376 |
| 1986 | 40 | R | 37.7%75,664 | 59.8%119,829 | 200,518 |
| 1984 | 40 | R | 34.0%86,748 | 64.4%164,257 | 254,974 |
| 1982 | 40 | R | 26.1%52,546 | 71.5%144,228 | 201,600 |
| 1980 | 40 | R | 21.8%66,512 | 70.2%213,999 | 304,997 |
| 1978 | 40 | R | 34.1%76,358 | 65.9%147,882 | 224,240 |
| 1976 | 40 | R | 40.7%102,132 | 59.3%148,512 | 250,644 |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2024 | D | 58.9%9,036,252 | 41.1%6,312,594 | 15,348,846 |
| 2022 | D | 61.1%6,621,621 | 38.9%4,222,029 | 10,843,650 |
| 2018 | D | 100.0%11,113,364 | 0.0%0 | 11,113,364 |
| 2016 | D | 100.0%12,244,170 | 0.0%0 | 12,244,170 |
| 2012 | D | 62.5%7,864,624 | 37.5%4,713,887 | 12,578,511 |
| 2010 | D | 52.2%5,218,441 | 42.2%4,217,366 | 10,000,093 |
| 2006 | D | 59.4%5,076,289 | 35.0%2,990,822 | 8,541,150 |
| 2004 | D | 57.7%6,955,728 | 37.8%4,555,922 | 12,053,242 |
| 2000 | D | 55.8%5,932,522 | 36.6%3,886,853 | 10,623,608 |
| 1998 | D | 53.1%4,410,056 | 43.0%3,575,078 | 8,311,905 |
| 1994 | D | 46.7%3,979,152 | 44.8%3,817,025 | 8,513,916 |
| 1992 | D | 47.9%5,173,467 | 43.0%4,644,182 | 10,799,436 |
| 1988 | R | 44.0%4,287,253 | 52.8%5,143,409 | 9,743,547 |
| 1986 | D | 49.3%3,646,672 | 47.9%3,541,804 | 7,398,462 |
| 1982 | R | 44.8%3,494,968 | 51.5%4,022,565 | 7,805,450 |
| 1980 | D | 56.5%4,704,098 | 37.1%3,091,671 | 8,324,012 |
| 1976 | R | 46.9%3,502,862 | 50.2%3,748,973 | 7,470,586 |
CA-40 covers dense urban communities in Los Angeles County where Democratic presidential candidates have routinely posted margins above 30 points, reflecting a heavily Latino and working-class electorate with consistently high partisan loyalty.
Across the recorded series it reached a Republican high of 22.0 points in 2012. Between 2020 and 2024 the district moved 4.5 points toward the Republican candidate; the 2024 margin was 12.2 points.
A population of 757,523, a 54% non-Hispanic-white share, and a median household income of $114,813 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 47 and Congressional District 22.
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.
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
California 40th Congressional District. Akashic. https://akashic.app/cd/0640/. Accessed May 20, 2026. License: CC BY 4.0.