California 18th State Senate District
Akashic| Kamala Harris ✓Democratic | 55.3% | 184,288 |
|---|---|---|
| Donald TrumpRepublican | 42.2% | 140,515 |
| Robert F. Kennedy Jr.American Independent | 2.5% | 8,377 |
County-level results (4 counties) — table
| County | Winner | Margin |
|---|---|---|
| Imperial County, CA | Republican | R+0.9 |
| Riverside County, CA | Republican | R+1.3 |
| San Bernardino County, CA | Republican | R+2.1 |
| San Diego County, CA | Democratic | D+16.8 |
| Year | Won | Democratic | Republican | Other | Margin | Total |
|---|---|---|---|---|---|---|
| D | 55.3%Harris184,288 | 42.2%Trump140,515 | 2.5%Kennedy8,377 | 333,180 | ||
| D | 64.1%Biden234,338 | 33.9%Trump123,900 | 2.0%Jorgensen7,361 | 365,599 | ||
| D | 67.1%Clinton195,955 | 27.8%Trump81,108 | 5.1%Johnson14,882 | 291,945 | ||
| D | 64.3%Obama152,408 | 35.7%Romney84,648 | 0.0% | 237,056 | ||
| D | 62.0%Obama147,048 | 37.4%McCain88,663 | 0.6%Nader1,343 | 237,054 |
| Year | Margin (D minus R) |
|---|---|
| 2008 | +24.6% |
| 2012 | +28.6% |
| 2016 | +39.3% |
| 2020 | +30.2% |
| 2024 | +13.1% |
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 28% 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 31 and State Senate District 22.
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 →
California 18th State Senate District. Akashic. https://akashic.app/sld-upper/06018/. Accessed May 20, 2026. License: CC BY 4.0.