Akashic
1892–2024
Akashic
California 18th Congressional District
presidential margin
2008D+41.82012D+45.42016D+47.12020D+42.72024D+28.5
full record · 2008 → 2024
D+28.5
2024
median income$103,517U.S. $80,734 · CA $99,122
median age34.8U.S. 39.1 · CA 37.9
poverty rate11.8%U.S. 12.5% · CA 12.0%
bachelor’s+ (25+)45.7%U.S. 35.6% · CA 36.6%
non-english53.2%U.S. 22.3% · CA 44.4%
race · ethnicity · ancestry
Mexican56.6%
Salvadoran1.8%
Spaniard0.9%
Aztec12.6%
German5.8%
English5.4%
Irish4.9%
Chinese2.8%
Asian Indian2.6%
Vietnamese1.8%
African American†1.5%
African0.2%
religion

Religious adherence is published only at the county level (U.S. Religion Census). See San Benito County.

American Community Survey 2024 5-year (income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024.

California 18th Congressional District

Akashic
2024 presidential electionCalifornia 18th Congressional DistrictHarrisD+28.5
California 18th Congressional District premium atlas map: Harris D+28.5, 311 precincts, 2 city labels.
2024
311 precincts by 2024 margin · 2 cities, own margin · ◎ bluest & reddest city
presidential history
Presidential margin, 2008–2024
Democratic minus Republican, by election
Presidential margin over timeDemocratic-minus-Republican presidential margin from 2008 to 2024. Most recent: +28.5% in 2024.+28.5%DR20082024
Presidential margin over time
YearMargin (D minus R)
2008+41.8%
2012+45.4%
2016+47.1%
2020+42.7%
2024+28.5%
DemocraticRepublican
current representation
Current officeholders
DZoe LofgrenU.S. House · CA-18-0.40
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.
YearDistrictWonDemocraticRepublicanTotal
202418D
64.6%147,674
35.4%80,832
228,506
202218D
65.9%99,776
34.1%51,737
151,513
202018D
100.0%344,139
0.0%0
344,139
201818D
74.5%225,142
25.5%77,096
302,238
201618D
71.1%230,460
28.9%93,470
323,930
201418D
67.8%133,060
32.2%63,326
196,386
201218D
70.5%212,831
29.5%89,103
301,934
201018D
58.5%72,853
41.5%51,716
124,569
200818D
100.0%130,192
0.0%0
130,192
200618D
65.5%71,182
34.5%37,531
108,713
200418D
67.5%103,732
32.5%49,973
153,705
200218D
51.3%56,181
43.4%47,528
109,593
200018D
67.1%121,003
31.3%56,465
180,328
199818D
86.8%118,842
0.0%0
136,931
199618D
65.7%108,827
31.8%52,695
165,586
199418D
65.5%91,106
31.7%44,046
139,054
199218D
84.7%139,704
0.0%0
165,011
199018D
100.0%98,804
0.0%0
98,804
198818D
69.9%125,715
30.1%54,034
179,749
198618D
71.3%101,480
28.7%40,907
142,387
198418D
67.3%128,186
32.7%62,339
190,525
198218D
59.5%92,762
38.3%59,664
155,927
198018R
29.0%51,415
71.0%126,046
177,461
197818R
40.7%58,900
59.3%85,663
144,563
197618R
35.8%56,683
64.2%101,658
158,341

U.S. Senate

Source · MIT Election Lab (MEDSL), Senate. CC-BY 4.0.
YearWonDemocraticRepublicanTotal
2024D
58.9%9,036,252
41.1%6,312,594
15,348,846
2022D
61.1%6,621,621
38.9%4,222,029
10,843,650
2018D
100.0%11,113,364
0.0%0
11,113,364
2016D
100.0%12,244,170
0.0%0
12,244,170
2012D
62.5%7,864,624
37.5%4,713,887
12,578,511
2010D
52.2%5,218,441
42.2%4,217,366
10,000,093
2006D
59.4%5,076,289
35.0%2,990,822
8,541,150
2004D
57.7%6,955,728
37.8%4,555,922
12,053,242
2000D
55.8%5,932,522
36.6%3,886,853
10,623,608
1998D
53.1%4,410,056
43.0%3,575,078
8,311,905
1994D
46.7%3,979,152
44.8%3,817,025
8,513,916
1992D
47.9%5,173,467
43.0%4,644,182
10,799,436
1988R
44.0%4,287,253
52.8%5,143,409
9,743,547
1986D
49.3%3,646,672
47.9%3,541,804
7,398,462
1982R
44.8%3,494,968
51.5%4,022,565
7,805,450
1980D
56.5%4,704,098
37.1%3,091,671
8,324,012
1976R
46.9%3,502,862
50.2%3,748,973
7,470,586

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 28% 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.

Political twins — districts

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

Congressional District 29
California
93.7twin score
2012–2020 trajectory% Latino≠ median income
Congressional District 44
California
92.9twin score
2012–2020 trajectory% Latino≠ college share
Congressional District 52
California
90.9twin score
2016–2020 trajectory% Latino% White≠ % unaffiliated

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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All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
California 18th Congressional District. Akashic. https://akashic.app/cd/0618/. Accessed May 20, 2026. License: CC BY 4.0.
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Places within California 18th Congressional District

counties it covers6
Fresno CountyKings CountyMonterey CountySan Benito CountySanta Clara CountySanta Cruz County

Frequently asked questions

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 5 presidential elections in California 18th Congressional District from 2008 to 2024. Of those, 5 went Democratic and 0 went Republican.