California State Senate seat · lines in effect since 2022
California Senate District 1
A district of about 928,000 people, 21% Hispanic, 25% of adults with a bachelor's degree. It votes R+20.1 relative to the nation for president.
2024 election
Nov 5, 2024- Megan Dahle (R) · won75.7%
- David Fennell (R)24.3%
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 12:13 PM ET
Where it sits among all 40 seats
Every California State Senate seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every election for this seat
15 races since 1968; the seat changed party 1 time. District numbers are redrawn after each census: each group is one set of lines.
| Year | Winner | Runner-up | Won by |
|---|---|---|---|
| Lines first used in 2022 | |||
| 2024 | Megan Dahle (R) | David Fennell (R) | 51.4 |
| Lines first used in 2012 | |||
| 2020 | Brian Dahle (R) | Pamela Dawn Swartz (D) | 19.4 |
| 2016 | Ted Gaines (R) | Rob Rowen (D) | 28.0 |
| 2012 | Ted Gaines (R) | Julie Griffithflatter (D) | 27.4 |
| Lines first used in 2002 | |||
| 2008 | Dave Cox (R) | Anselmo A. Chavez (D) | 24.5 |
| 2004 | Dave Cox (R) | Kristine Lang McDonald (D) | 28.8 |
| Lines first used in 1992 | |||
| 2000 | Thomas Oller (R) | Thomas Romero (D) | 19.8 |
| 1996 | Tim Leslie (R) | Thomas Romero (D) | 26.3 |
| 1992 | Tim Leslie (R) | Thomas Romero (D) | 19.0 |
| Lines first used in 1982 | |||
| 1988 | John Doolittle (R) | Roy D. Whiteaker (D) | 8.6 |
| 1984 | John Doolittle (R) | Ray Johnson (I) | 3.3 |
| Lines first used in 1972 | |||
| 1980 | Ray Johnson (R) | Don W. Huggins (D) | 43.1 |
| 1976 | Ray Johnson (R)Flip | Randolph Collier (D) | 8.9 |
| 1972 | Randolph Collier (D) | Henry K. Rogers (R) | 42.1 |
| Lines first used in 1962 | |||
| 1968 | Randolph Collier (D) | E. Robert Dryden (R) | 22.2 |
Won by: the winner's lead over the runner-up, in points of the vote. Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Districts that overlap District 1
The state's districts in other chambers that share residents with this one, and the share of District 1's area in each.
Who lives here, compared
Grey bars show the spread of all 40 seats. Small marks are other seats in California. The black marker is District 1.
Lower than 74% of seats.
Highest of 40 seats.
Lower than 87% of seats.
Lower than 97% of seats.
Lower than 87% of seats.
Least dense of 40 seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 436% Hispanic · 26% college gradsR+11.1Held RDistrict 12
38% Hispanic · 31% college gradsR+25.0Held RDistrict 19
40% Hispanic · 28% college gradsR+2.6Not up in 2026District 32
35% Hispanic · 35% college gradsR+14.0Held R
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET