California State Senate seat · lines in effect since 2022
California Senate District 12
A district of about 997,000 people, 38% Hispanic, 31% of adults with a bachelor's degree. It votes R+25.0 relative to the nation for president.
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 race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2022 | |
|---|---|
| California State Senate | R+37.3 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: California Secretary of StateUpdated Nov 7, 2026, 3:01 PM ET
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 12.
Lower than 62% of seats.
Higher than 87% of seats.
Higher than 56% of seats.
Lower than 62% of seats.
Lower than 67% of seats.
Less dense than 90% of 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 3235% Hispanic · 35% college gradsR+14.0Held RDistrict 4
36% Hispanic · 26% college gradsR+11.1Held RDistrict 19
40% Hispanic · 28% college gradsR+2.6Not up in 2026District 1
21% Hispanic · 25% college gradsR+20.1Not up in 2026
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
Who has held it
These lines took effect in 2022.
- Nathan Magsig (R)
2027– · Won 2026 by 26.2 - Shannon Grove (R)
2023–2027 · Won 2022 by 37.3
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)