congressional districtCalifornia 18th Congressional District
presidential margin
2004–2024 · Democratic minus Republican
2004D+28.0
2008D+41.8
2012D+44.1
2016D+47.1
2020D+42.7
2024D+28.5
net swing · 2004→2024D+0.4D+28.0 → D+28.5
vs. U.S. · 2024D+30.0D+28.5 vs R+1.5
presidential returns
2024 turnout 56.7% of 418,293 citizens 18+
Year
Democrat
Republican
Others
Total
CVAP
Turnout
2024
148,652
81,092
7,459
237,203
418,293
56.7%
2020
187,833
73,606
5,783
267,222
415,366†
64.3%
2016
148,399
49,408
12,238
210,045
401,698†
52.3%
2012
133,402
50,099
5,507
189,008
378,512†
49.9%
2008
127,509
52,083
921
180,513
362,504†
49.8%
2004
110,260
61,267
3,198
174,725
346,496†
50.4%
† Citizen voting-age population estimated for prior cycles from the constituent-county ACS trend anchored to the current figure. Source: ACS 5-year, table B05003.
——
D+60R+60
20042024
District by 2024 margin · Precinct returns · VEST · MIT Election Lab
People and households
Who lives here
Exact values for this place, its state, and the United States.
Race · ethnicity · ancestry
Communities and origins
GroupCA-18CaliforniaUnited States
Mexican56.6%32.3%11.3%
Salvadoran1.8%2.0%0.7%
Spaniard0.9%0.3%—
Puerto Rican0.7%0.6%1.8%
Spanish0.7%0.3%—
Guatemalan0.7%1.3%0.5%
Colombian0.7%0.3%0.4%
Nicaraguan0.4%0.3%—
German5.8%6.8%12.5%
English5.4%6.3%9.5%
Irish4.9%5.9%9.4%
Italian3.5%3.4%4.8%
American1.7%2.8%5.3%
Portuguese1.1%——
French1.1%1.3%1.6%
Iranian0.7%——
Chinese2.8%3.9%1.3%
Asian Indian2.6%2.3%1.4%
Vietnamese1.8%1.7%0.6%
Filipino1.3%3.3%0.9%
Korean0.5%1.2%0.4%
Japanese0.3%0.6%0.2%
Taiwanese0.3%0.3%—
African American†1.5%4.4%9.9%
African0.2%0.3%0.5%
Aztec12.6%0.3%—
Hispanic or Latino counts residents of any race; the race groups count only their non-Hispanic residents, so the groups are mutually exclusive and sum to 100%. Expand a row to see ancestries reported within that group.
Age and life stage
Measure
CA-18
California
United States
Median age
34.8
37.9
39.1
Age 18–24
9.1%
9.1%
9.2%
Age 65 and older
14.6%
15.6%
17.2%
Household economy
Measure
CA-18
California
United States
Median household income
$103,517
$99,122
$84,427
Poverty rate
11.8%
12.0%
12.5%
Bachelor's degree or higher (25+)
45.7%
36.6%
35.6%
Languages at home
Measure
CA-18
California
United States
Speaks a non-English language at home
53.2%
44.4%
22.3%
Spanish
26.3%
28.4%
13.6%
Other Indo-European
5.6%
3.4%
2.0%
Chinese (incl. Mandarin & Cantonese)
7.0%
3.5%
1.1%
Vietnamese
4.3%
1.5%
0.5%
Religious landscape
Measure
CA-18
California
United States
Catholic
—
26.2%
18.6%
Evangelical Protestant
—
9.0%
16.5%
Unclaimed / not counted
—
55.2%
51.5%
American Community Survey 2024 5-year (CVAP, income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024 · 2020 U.S. Religion Census (ASARB) — congregational adherents; unclaimed is the residual not counted by congregations.
California 18th Congressional District
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
+28.0%
2008
+41.8%
2012
+44.1%
2016
+47.1%
2020
+42.7%
2024
+28.5%
DemocraticRepublican
6 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024). Swing · margin change from the prior cycle. vs U.S. · margin relative to the national result that year. Third-party votes in 2012 are allocated from certified county totals by this place's share of each county's two-party vote — that cycle's precinct source records two-party splits. † 2004 sub-county results are estimated: the source's block-level detail for this cycle was unreliable — either county/municipality-level consolidated reporting (COVID-era) or a precinct-to-block allocation that misplaced votes — so the figures are allocated from the constituent county totals in proportion to the place and scaled to certified totals.
Federal officeholders only. State and local officeholders are planned for the next data pass.
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
18
D
64.6%147,674
35.4%80,832
228,506
2022
18
D
65.9%99,776
34.1%51,737
151,513
2020
18
D
100.0%344,139
0.0%0
344,139
2018
18
D
74.5%225,142
25.5%77,096
302,238
2016
18
D
71.1%230,460
28.9%93,470
323,930
2014
18
D
67.8%133,060
32.2%63,326
196,386
2012
18
D
70.5%212,831
29.5%89,103
301,934
2010
18
D
58.5%72,853
41.5%51,716
124,569
2008
18
D
100.0%130,192
0.0%0
130,192
2006
18
D
65.5%71,182
34.5%37,531
108,713
2004
18
D
67.5%103,732
32.5%49,973
153,705
2002
18
D
51.3%56,181
43.4%47,528
109,593
2000
18
D
67.1%121,003
31.3%56,465
180,328
1998
18
D
86.8%118,842
0.0%0
136,931
1996
18
D
65.7%108,827
31.8%52,695
165,586
1994
18
D
65.5%91,106
31.7%44,046
139,054
1992
18
D
84.7%139,704
0.0%0
165,011
1990
18
D
100.0%98,804
0.0%0
98,804
1988
18
D
69.9%125,715
30.1%54,034
179,749
1986
18
D
71.3%101,480
28.7%40,907
142,387
1984
18
D
67.3%128,186
32.7%62,339
190,525
1982
18
D
59.5%92,762
38.3%59,664
155,927
1980
18
R
29.0%51,415
71.0%126,046
177,461
1978
18
R
40.7%58,900
59.3%85,663
144,563
1976
18
R
35.8%56,683
64.2%101,658
158,341
U.S. Senate
The statewide Senate race, counted in this district — aggregated from the precinct-level returns that fall inside its boundaries (not a statewide figure).
Votes · MIT Election Lab (MEDSL) precinct returns (CC BY 4.0); aggregated to the district over VEST precinct geometry (CC BY-NC 4.0).
Year
Won
Democratic
Republican
Total
2024
D
64.0%146,565
36.0%82,305
228,870
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
2024 U.S. Senate — every candidate counted in this district
Adam B Schiff · Democrat64.0%146,565
Steve Garvey · Republican36.0%82,305
CA-18 spans the heart of Santa Clara County, where a highly educated, tech-sector workforce has pushed Democratic presidential margins above 50 points — among the widest in the country.
Across the recorded series it reached a Democratic high of 47.1 points in 2016. Between 2020 and 2024 the district moved 14.3 points toward the Republican candidate; the 2024 margin was 28.5 points.
A population of 770,191, a 19% non-Hispanic-white share, and a median household income of $103,517 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 29 and Congressional District 44.
Akashic
Political twins — districts
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 →
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California 18th Congressional District. Akashic. https://akashic.app/cd/0618/. Accessed May 20, 2026. License: CC BY 4.0.
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How did California 18th Congressional District vote in 2024?
In 2024, California 18th Congressional District voted Democratic by 28.5 points (D+28.5), carried by the Democratic candidate. Out of 237,203 votes cast, 148,652 went Democratic and 81,092 went Republican.
How many people live in California 18th Congressional District?
California 18th Congressional District has a population of 770,191 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in California 18th Congressional District?
Median household income in California 18th Congressional District is $103,517 — above the national median of $80,734. The California state median is $99,122.
What is the political history of California 18th Congressional District?
Akashic tracks 6 presidential elections in California 18th Congressional District from 2004 to 2024. Of those, 6 went Democratic and 0 went Republican.
