California 42nd Congressional District
Akashic| Year | Margin (D minus R) |
|---|---|
| 2008 | +12.0% |
| 2012 | +7.5% |
| 2016 | +17.2% |
| 2020 | +19.4% |
| 2024 | +13.1% |
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 | 42 | D | 68.1%159,153 | 31.9%74,410 | 233,563 |
| 2022 | 42 | D | 68.4%99,217 | 31.6%45,903 | 145,120 |
| 2020 | 42 | R | 42.9%157,773 | 57.1%210,274 | 368,047 |
| 2018 | 42 | R | 43.5%100,892 | 56.5%131,040 | 231,932 |
| 2016 | 42 | R | 41.2%104,689 | 58.8%149,547 | 254,236 |
| 2014 | 42 | R | 34.3%38,850 | 65.7%74,540 | 113,390 |
| 2012 | 42 | R | 39.4%84,702 | 60.6%130,245 | 214,947 |
| 2010 | 42 | R | 31.9%65,122 | 62.2%127,161 | 204,398 |
| 2008 | 42 | R | 39.8%104,909 | 60.2%158,404 | 263,313 |
| 2006 | 42 | R | 0.0%0 | 100.0%129,720 | 129,720 |
| 2004 | 42 | R | 31.9%78,393 | 68.1%167,632 | 246,025 |
| 2002 | 42 | R | 29.0%42,090 | 67.8%98,476 | 145,246 |
| 2000 | 42 | D | 59.8%90,585 | 35.1%53,239 | 151,577 |
| 1998 | 42 | D | 55.3%62,207 | 40.3%45,328 | 112,520 |
| 1996 | 42 | D | 50.5%52,166 | 49.5%51,170 | 103,336 |
| 1994 | 42 | D | 51.1%58,888 | 48.8%56,259 | 115,205 |
| 1992 | 42 | D | 50.7%79,780 | 44.0%69,251 | 157,455 |
| 1990 | 42 | R | 36.5%67,189 | 59.3%109,353 | 184,286 |
| 1988 | 42 | R | 33.0%78,778 | 64.2%153,280 | 238,621 |
| 1986 | 42 | R | 24.7%47,586 | 72.8%140,364 | 192,711 |
| 1984 | 42 | R | 24.6%60,025 | 73.0%177,783 | 243,619 |
| 1982 | 42 | R | 28.3%58,690 | 69.0%142,845 | 207,049 |
| 1980 | 42 | R | 46.7%69,936 | 53.3%79,713 | 149,649 |
| 1978 | 42 | D | 73.7%85,126 | 26.3%30,319 | 115,445 |
| 1976 | 42 | D | 76.0%103,062 | 24.0%32,565 | 135,627 |
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 |
California's 42nd covers working-class communities in the western Inland Empire, where a rightward shift among Hispanic voters has widened Republican presidential margins to levels unusual for a California district.
Across the recorded series it reached a Democratic high of 19.4 points in 2020. Between 2020 and 2024 the district moved 6.3 points toward the Republican candidate; the 2024 margin was 13.1 points.
A population of 757,090, a 51% non-Hispanic-white share, and a median household income of $106,478 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 27 and Congressional District 46.
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 42nd Congressional District. Akashic. https://akashic.app/cd/0642/. Accessed May 20, 2026. License: CC BY 4.0.