California 31st Congressional District (CA) — Elections 1892–2024

2024

307 precincts by 2024 margin · 7 cities, own margin · ◎ bluest & reddest city

presidential history

Presidential margin, 2008–2024

Democratic minus Republican, by election

Presidential margin over time
Year	Margin (D minus R)
2008	+19.4%
2012	+22.2%
2016	+28.7%
2020	+25.3%
2024	+12.2%

DemocraticRepublican

current representation

Current officeholders

DGilbert CisnerosU.S. House · CA-31-0.47

DAdam SchiffU.S. Senate-0.35

DAlex PadillaU.S. Senate-0.44

Federal officeholders only. State and local officeholders are planned for the next data pass.

Source · Voteview HSall_members.csv.

Congressional elections · 25 House races · 17 Senate races

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.

Source · MIT Election Lab (MEDSL), House. CC-BY 4.0.
Year	District	Won	Democratic	Republican	Total
2024	31	D	59.7%148,095	40.3%99,856	247,951
2022	31	D	59.5%91,472	40.5%62,153	153,625
2020	31	D	61.3%175,315	38.7%110,735	286,050
2018	31	D	58.7%110,143	41.3%77,352	187,495
2016	31	D	56.1%121,070	43.9%94,866	215,936
2014	31	D	51.7%51,622	48.3%48,162	99,784
2012	31	R	0.0%0	100.0%161,219	161,219
2010	31	D	83.8%76,363	16.2%14,740	91,106
2008	31	D	100.0%110,955	0.0%0	110,955
2006	31	D	100.0%64,952	0.0%0	64,952
2004	31	D	80.2%89,363	19.8%22,048	111,411
2002	31	D	81.2%54,569	18.8%12,674	67,243
2000	31	D	79.4%89,600	0.0%0	112,914
1998	31	D	70.0%61,173	22.6%19,786	87,360
1996	31	D	67.5%69,285	28.0%28,705	102,690
1994	31	D	59.1%50,541	40.9%34,926	85,467
1992	31	D	62.6%68,324	37.4%40,873	109,197
1990	31	D	67.1%56,394	32.9%27,593	83,987
1988	31	D	71.6%100,919	25.5%36,017	141,027
1986	31	D	70.3%77,126	27.6%30,322	109,781
1984	31	D	70.7%100,658	29.3%41,691	142,349
1982	31	D	72.4%86,718	27.6%33,043	119,761
1980	31	D	64.4%69,146	35.6%38,203	107,349
1978	31	D	67.8%55,667	32.2%26,490	82,157
1976	31	D	100.0%83,155	0.0%0	83,155

U.S. Senate

Source · MIT Election Lab (MEDSL), Senate. CC-BY 4.0.
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 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.

Across the recorded series it reached a Democratic high of 28.7 points in 2016. Between 2020 and 2024 the district moved 13.1 points toward the Republican candidate; the 2024 margin was 12.2 points.

A population of 758,317, a 29% non-Hispanic-white share, and a median household income of $92,169 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 38 and Congressional District 35.

Political twins — districts

The congressional districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.

Congressional District 38

California

97.8twin score

% Latino% White% Asian

Congressional District 35

California

92.3twin score

% Latino% White2016 margin≠ % Asian

Congressional District 52

California

90.8twin score

% Latino% White2016–2020 trajectory

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 →

Cite this page

All citations released under CC BY 4.0. Attribution: Akashic Intelligence.

California 31st Congressional District. Akashic. https://akashic.app/cd/0631/. Accessed May 20, 2026. License: CC BY 4.0.

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Frequently asked questions

How did California 31st Congressional District vote in 2024?

In 2024, California 31st Congressional District voted Democratic by 12.2 points (D+12.2), carried by the Democratic candidate. Out of 291,986 votes cast, 159,444 went Democratic and 123,752 went Republican.

How many people live in California 31st Congressional District?

California 31st Congressional District has a population of 758,317 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.

What is the median household income in California 31st Congressional District?

Median household income in California 31st Congressional District is $92,169 — above the national median of $80,734. The California state median is $99,122.

What is the political history of California 31st Congressional District?

Akashic tracks 5 presidential elections in California 31st Congressional District from 2008 to 2024. Of those, 5 went Democratic and 0 went Republican.