California State Assembly seat · lines in effect since 2022
California Assembly District 66
A district of about 467,000 people, 23% Hispanic and 24% Asian, 57% of adults with a bachelor's degree. It votes D+25.3 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 | 2024 | |
|---|---|---|
| California State Assembly | D+19.9 | D+20.4 |
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 66.
Higher than 87% of seats.
Lower than 54% of seats.
Lower than 80% of seats.
Higher than 54% of seats.
Higher than 81% of seats.
Denser than 61% 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 7322% Hispanic · 61% college gradsD+19.5Held DDistrict 76
31% Hispanic · 49% college gradsD+13.9Held DDistrict 78
23% Hispanic · 53% college gradsD+38.0Held DDistrict 77
67% college gradsD+31.1Held 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.
- Paul Seo (D)
2027– · Won 2026 by 21.1 - Al Muratsuchi (D)
2023–2027 · Won 2022 by 19.9, 2024 by 20.4
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)