state senate districtCalifornia 18th State Senate District
presidential margin
2004–2024 · Democratic minus Republican
2004D+7.5
2008D+24.6
2012D+27.9
2016D+39.3
2020D+30.2
2024D+13.1
net swing · 2004→2024D+5.6D+7.5 → D+13.1
vs. U.S. · 2024D+14.6D+13.1 vs R+1.5
presidential returns
2024 turnout 55.0% of 605,910 citizens 18+
Year
Democrat
Republican
Others
Total
CVAP
Turnout
2024
184,288
140,515
8,377
333,180
605,910
55.0%
2020
234,338
123,900
7,361
365,599
590,418†
61.9%
2016
195,955
81,108
14,882
291,945
550,218†
53.1%
2012
152,408
84,648
5,783
242,839
507,245†
47.9%
2008
147,048
88,663
1,343
237,054
467,614†
50.7%
2004
114,217
98,022
3,591
215,830
427,982†
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
Boundary 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 SD 18CaliforniaUnited States
Mexican60.3%32.3%11.3%
Salvadoran1.4%2.0%0.7%
Guatemalan1.2%1.3%0.5%
Puerto Rican1.0%0.6%1.8%
Spaniard0.6%0.3%—
Spanish0.6%0.3%—
Colombian0.4%0.3%0.4%
Cuban0.3%—0.7%
German6.0%6.8%12.5%
English5.3%6.3%9.5%
Irish5.0%5.9%9.4%
Italian2.7%3.4%4.8%
American2.2%2.8%5.3%
French1.2%1.3%1.6%
Scottish1.0%0.9%1.3%
Polish0.9%0.9%2.2%
Filipino2.9%3.3%0.9%
Chinese1.5%3.9%1.3%
Asian Indian0.9%2.3%1.4%
Vietnamese0.9%1.7%0.6%
Korean0.5%1.2%0.4%
Japanese0.3%0.6%0.2%
African American†3.5%4.4%9.9%
African0.3%0.3%0.5%
Aztec9.0%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 SD 18
California
United States
Median age
36.2
37.9
39.1
Age 18–24
9.6%
9.1%
9.2%
Age 65 and older
14.9%
15.6%
17.2%
Household economy
Measure
CA SD 18
California
United States
Median household income
$79,843
$99,122
$84,427
Poverty rate
13.3%
12.0%
12.5%
Bachelor's degree or higher (25+)
29.5%
36.6%
35.6%
Languages at home
Measure
CA SD 18
California
United States
Speaks a non-English language at home
44.0%
44.4%
22.3%
Spanish
35.4%
28.4%
13.6%
Other Indo-European
1.4%
3.4%
2.0%
Chinese (incl. Mandarin & Cantonese)
1.3%
3.5%
1.1%
Tagalog (incl. Filipino)
1.7%
2.1%
0.6%
Religious landscape
Measure
CA SD 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 State Senate District
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
+7.5%
2008
+24.6%
2012
+27.9%
2016
+39.3%
2020
+30.2%
2024
+13.1%
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.
Year
Won
Democratic
Republican
Other
Margin
Swing
vs U.S.
Total
D
55.3%Harris184,288
42.2%Trump140,515
2.5%
D+13.1
R+17.1
D+14.6
333,180
D
64.1%Biden234,338
33.9%Trump123,900
2.0%
D+30.2
R+9.1
D+25.8
365,599
D
67.1%Clinton195,955
27.8%Trump81,108
5.1%
D+39.3
D+11.4
D+37.2
291,945
D
62.8%Obama152,408
34.9%Romney84,648
2.4%
D+27.9
D+3.3
D+24.0
242,839
D
62.0%Obama147,048
37.4%McCain88,663
0.6%
D+24.6
D+17.1
D+17.4
237,054
D
52.9%Kerry114,217
45.4%Bush98,022
1.7%
D+7.5
—
D+10.0
215,830
current representation
Current officeholders
DSteve PadillaState Senate · 18
State legislative officeholder from OpenStates nightly current-legislator data.
With a 2024 presidential margin of D+72.1, this Los Angeles–area district ranks among the most reliably Democratic constituencies in the state senate, reflecting dense urban settlement and a heavily nonwhite electorate.
Across the recorded series it reached a Democratic high of 39.3 points in 2016. Between 2020 and 2024 the district moved 17.1 points toward the Republican candidate; the 2024 margin was 13.1 points.
A population of 963,063, a 16% non-Hispanic-white share, and a median household income of $79,843 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 22 and State Senate District 31.
Akashic
Political twins — state-senate districts
The state-senate 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 →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
California 18th State Senate District. Akashic. https://akashic.app/sld-upper/06018/. Accessed May 20, 2026. License: CC BY 4.0.
How did California 18th State Senate District vote in 2024?
In 2024, California 18th State Senate District voted Democratic by 13.1 points (D+13.1), carried by the Democratic candidate. Out of 333,180 votes cast, 184,288 went Democratic and 140,515 went Republican.
How many people live in California 18th State Senate District?
California 18th State Senate District has a population of 963,063 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in California 18th State Senate District?
Median household income in California 18th State Senate District is $79,843 — below the national median of $80,734. The California state median is $99,122.
What is the political history of California 18th State Senate District?
Akashic tracks 6 presidential elections in California 18th State Senate District from 2004 to 2024. Of those, 6 went Democratic and 0 went Republican.
