California 18th State Senate District, California: Tossup district. In 2024, voted D+5%. Republican peak: R+45 in 1924.
Key facts
- 2024 presidential margin
- D+5MIT Election Lab
- Political archetype
- TossupAkashic typology
- Population
- 2,086,7312024 5-year
- Median household income
- $92,7352024 5-year
- White (non-Hispanic)
- 38.5%2024 5-year
- Black
- 5.7%2024 5-year
- Hispanic / Latino
- 50.1%2024 5-year
- Peak Democratic margin
- D+37 in 1912MIT Election Lab
- Peak Republican margin
- R+45 in 1924MIT Election Lab
Constituent county margins for State Senate District 18, 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 | 412,261 | 375,031 | 809,654 | ||
| D | 487,001 | 362,956 | 868,548 | ||
| D | 364,562 | 272,333 | 681,236 | ||
| D | 314,308 | 275,612 | 604,643 | ||
| D | 320,171 | 276,206 | 608,848 | ||
| R | 237,374 | 294,708 | 538,421 | ||
| R | 206,311 | 223,321 | 447,982 | ||
| R | 178,634 | 179,827 | 401,926 | ||
| D | 170,147 | 162,311 | 443,234 | ||
| R | 145,166 | 220,687 | 370,481 | ||
| R | 112,023 | 208,850 | 324,611 | ||
| R | 86,900 | 173,525 | 289,358 | ||
| R | 111,928 | 129,580 | 247,610 | ||
| R | 86,061 | 144,803 | 239,987 | ||
| R | 74,671 | 107,100 | 198,666 | ||
| D | 98,685 | 86,315 | 185,096 | ||
| R | 72,881 | 91,040 | 164,550 | ||
| R | 49,997 | 80,551 | 131,064 | ||
| R | 42,570 | 71,924 | 115,345 | ||
| R | 38,598 | 43,927 | 85,281 | ||
| D | 34,361 | 33,666 | 68,493 | ||
| D | 33,722 | 29,839 | 64,317 | ||
| D | 30,667 | 21,003 | 52,345 | ||
| D | 25,512 | 18,866 | 46,472 | ||
| R | 9,788 | 25,118 | 35,276 | ||
| R | 2,178 | 13,612 | 25,308 | ||
| R | 5,439 | 13,681 | 20,912 | ||
| R | 9,414 | 10,393 | 21,955 | ||
| O | 5,034 | 0 | 13,464 | ||
| R | 2,024 | 3,837 | 7,102 | ||
| R | 737 | 2,374 | 3,846 | ||
| R | 1,257 | 2,058 | 3,607 | ||
| R | 1,758 | 1,876 | 3,763 | ||
| R | 750 | 1,112 | 2,369 | ||
| R | 884 | 1,236 | 2,217 | ||
| R | 311 | 411 | 739 | ||
| R | 190 | 228 | 428 | ||
| R | 199 | 230 | 432 |
Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
6.7%
English
6.0%
Irish
5.6%
Italian
3.0%
American
2.5%
French
1.2%
Scottish
0.7%
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: 36.4 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
$92,735
State Senate District 18 ranks near the middle of US counties.
State Senate District 18$92,735
California$99,122
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
11.7%
Child poverty is below the national average.
Children under 1814.4%
Working age (18–64)10.7%
Seniors (65+)12.1%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
56.0%
speak English only
Spanish35.4%
Asian & Pacific Islander5.2%
Other Indo-European2.3%
Other languages1.2%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 53.2% of residents not counted as adherents by any reporting body.
With a 2024 presidential margin of D+72.1, this Los Angeles–area district ranks among the most reliably progressive constituencies in the state senate, reflecting dense urban settlement and a heavily nonwhite electorate.
The district's recent history is a story of close margins. The Democratic margin reached thirty-seven points in 1912; the Republican margin reached forty-five points in 1924. Most other elections have been decided by single-digit points.
Its demographics — a population of 2,086,731, a 39% non-Hispanic-white share, a median household income of $92,735 — situate the district close to national averages on several dimensions.
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.
State Senate District 18, California. Akashic. https://akashic.app/sld-upper/06018/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Frequently asked questions
How did State Senate District 18, California vote in 2024?
In 2024, State Senate District 18, California voted Democratic by 4.6 points (D+5), carried by the Democratic candidate. Out of 809,654 votes cast, 412,261 went Democratic and 375,031 went Republican.
What is State Senate District 18, California's political archetype?
Akashic classifies State Senate District 18, California as a "Tossup" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 11 times, Republican 26 times, and other 1 times.
When did State Senate District 18, California last vote Republican?
The most recent presidential election in which State Senate District 18, California voted Republican was 2004.
How many people live in State Senate District 18, California?
State Senate District 18, California has a population of 2,086,731 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in State Senate District 18, California?
Median household income in State Senate District 18, California is $92,735 — above the national median of $80,734. The California state median is $99,122.
What is the political history of State Senate District 18, California?
Akashic tracks 38 presidential elections in State Senate District 18, California from 1876 to 2024. Of those, 11 went Democratic and 26 went Republican. The district's archetype — "Tossup" — captures the overall trajectory of that voting record.