California 31st Congressional District, California: Urban anchor district. In 2024, voted D+33%. Republican peak: R+58 in 1924.
Key facts
- 2024 presidential margin
- D+33MIT Election Lab
- Political archetype
- Urban anchorAkashic typology
- Population
- 505,6412024 5-year
- Median household income
- $90,1122024 5-year
- White (non-Hispanic)
- 30.9%2024 5-year
- Black
- 7.7%2024 5-year
- Hispanic / Latino
- 48.4%2024 5-year
- Peak Democratic margin
- D+49 in 2016MIT Election Lab
- Peak Republican margin
- R+58 in 1924MIT Election Lab
D
CISNEROS, Gil
−1 liberal+1 conservative
Predecessors: NAPOLITANO, Grace Flores (2023–2025), AGUILAR, Peter Rey (2021–2023), AGUILAR, Peter Rey (2019–2021), AGUILAR, Peter Rey (2017–2019)
Source · Voteview / Lewis, Poole, Rosenthal et al. (CC-BY).
Constituent county margins for Congressional District 31, CAOne cell per constituent county, colored by 2024 presidential margin from deep red (Republican) through neutral to deep blue (Democratic), ordered bluest first.
R+60D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 124,603 | 61,338 | 192,236 | ||
| D | 156,140 | 59,053 | 220,839 | ||
| D | 127,039 | 39,681 | 177,040 | ||
| D | 114,282 | 45,639 | 163,986 | ||
| D | 118,352 | 49,304 | 171,057 | ||
| D | 98,345 | 55,480 | 155,852 | ||
| D | 88,177 | 44,948 | 138,936 | ||
| D | 73,750 | 38,485 | 124,289 | ||
| D | 74,569 | 41,220 | 141,939 | ||
| D | 70,745 | 63,908 | 136,334 | ||
| R | 59,742 | 73,414 | 134,697 | ||
| R | 50,511 | 63,125 | 125,793 | ||
| D | 62,989 | 60,568 | 126,767 | ||
| R | 61,344 | 79,889 | 145,907 | ||
| R | 63,059 | 65,288 | 137,020 | ||
| D | 80,847 | 59,854 | 140,780 | ||
| D | 68,243 | 67,153 | 135,810 | ||
| R | 51,957 | 64,964 | 117,299 | ||
| R | 48,978 | 63,251 | 113,474 | ||
| D | 41,895 | 41,459 | 89,135 | ||
| D | 45,687 | 34,355 | 80,499 | ||
| D | 42,412 | 29,604 | 72,958 | ||
| D | 39,042 | 18,424 | 58,273 | ||
| D | 28,584 | 19,266 | 49,983 | ||
| R | 10,823 | 26,473 | 37,699 | ||
| R | 1,730 | 15,448 | 23,582 | ||
| R | 2,869 | 9,182 | 13,288 | ||
| R | 5,880 | 6,988 | 13,811 | ||
| O | 2,841 | 0 | 8,521 | ||
| R | 1,138 | 2,138 | 3,767 | ||
| R | 517 | 1,676 | 2,520 | ||
| R | 678 | 990 | 1,796 | ||
| R | 827 | 871 | 1,755 | ||
| R | 419 | 527 | 1,174 | ||
| R | 521 | 712 | 1,302 | ||
| R | 241 | 288 | 558 | ||
| R | 147 | 150 | 314 | ||
| D | 186 | 157 | 344 |
Congressional elections · 17 Senate races
U.S. Senate
| Year | Won | D % | R % | Total |
|---|---|---|---|---|
| 2024 | D | 58.9% | 41.1% | 15,348,846 |
| 2022 | D | 61.1% | 38.9% | 10,843,650 |
| 2018 | D | 100.0% | 0.0% | 11,113,364 |
| 2016 | D | 100.0% | 0.0% | 12,244,170 |
| 2012 | D | 62.5% | 37.5% | 12,578,511 |
| 2010 | D | 52.2% | 42.2% | 10,000,160 |
| 2006 | D | 59.4% | 35.0% | 8,541,476 |
| 2004 | D | 57.7% | 37.8% | 12,053,295 |
| 2000 | D | 55.8% | 36.6% | 10,623,608 |
| 1998 | D | 53.1% | 43.0% | 8,311,905 |
| 1994 | D | 46.7% | 44.8% | 8,514,089 |
| 1992 | D | 47.9% | 43.0% | 10,799,703 |
| 1988 | R | 44.0% | 52.8% | 9,743,598 |
| 1986 | D | 49.3% | 47.9% | 7,398,462 |
| 1982 | R | 44.8% | 51.5% | 7,805,450 |
| 1980 | D | 56.5% | 37.1% | 8,324,012 |
| 1976 | R | 46.9% | 50.2% | 7,470,586 |
Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
4.3%
Irish
3.8%
English
3.8%
American
3.1%
Italian
2.5%
Polish
1.1%
French
1.0%
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 38.2 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$90,112
Congressional District 31 ranks near the middle of US counties.
Congressional District 31$90,112
California$99,122
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
13.7%
Children face moderate poverty.
Children under 1817.6%
Working age (18–64)12.5%
Seniors (65+)15.9%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
44.9%
speak English only
Spanish37.6%
Asian & Pacific Islander10.7%
Other Indo-European5.6%
Other languages1.2%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 49.1% of residents not counted as adherents by any reporting body.
California's 31st district covers a dense stretch of the eastern San Gabriel Valley with a majority-Latino and Asian-American electorate, producing a modest Democratic lean that has narrowed as the region's suburban composition continues to shift.
The Democratic margin in California 31st Congressional District has been steady. It reached its modern peak at forty-nine points in 2016; the 2024 margin was thirty-three points, still in line with the district's long pattern.
Its political identity is inseparable from its demographic profile: a 31% non-Hispanic-white share, a median household income of $90,112, and the full diversity of a major metropolitan center.
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Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Congressional District 31, California. Akashic. https://akashic.app/cd/0631/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Frequently asked questions
How did Congressional District 31, California vote in 2024?
In 2024, Congressional District 31, California voted Democratic by 32.9 points (D+33), carried by the Democratic candidate. Out of 192,236 votes cast, 124,603 went Democratic and 61,338 went Republican.
What is Congressional District 31, California's political archetype?
Akashic classifies Congressional District 31, California as a "Urban anchor" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 19 times, Republican 18 times, and other 1 times.
When did Congressional District 31, California last vote Republican?
The most recent presidential election in which Congressional District 31, California voted Republican was 1984.
How many people live in Congressional District 31, California?
Congressional District 31, California has a population of 505,641 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Congressional District 31, California?
Median household income in Congressional District 31, California is $90,112 — above the national median of $80,734. The California state median is $99,122.
What is the political history of Congressional District 31, California?
Akashic tracks 38 presidential elections in Congressional District 31, California from 1876 to 2024. Of those, 19 went Democratic and 18 went Republican. The district's archetype — "Urban anchor" — captures the overall trajectory of that voting record.