California State Assembly seat · lines in effect since 2022
California Assembly District 18
A district of about 479,000 people, 28% Hispanic, 48% of adults with a bachelor's degree. It votes D+77.6 relative to the nation for president.
Where it sits among all 80 seats
Every California State Assembly 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 Assembly | D+79.9 |
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 80 seats. Small marks are other seats in California. The black marker is District 18.
Higher than 72% of seats.
Lower than 91% of seats.
Lower than 65% of seats.
Higher than 97% of seats.
Higher than 72% of seats.
Denser than 76% 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 5534% Hispanic · 49% college gradsD+66.2Held DDistrict 14
27% Hispanic · 55% college gradsD+75.7Held DDistrict 61
46% Hispanic · 25% BlackD+61.2Held DDistrict 17
57% college gradsD+72.0Held D
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.
- Mia Bonta (D)
2023– · Won 2022 by 79.9, 2024 by 60.5, 2026 by 58.3
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)