California State Assembly seat · lines in effect since 2022
California Assembly District 21
A district of about 476,000 people, 28% Hispanic and 27% Asian, 56% of adults with a bachelor's degree. It votes D+54.0 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.
| 2024 | 2026 | |
|---|---|---|
| California State Assembly | D+47.7 | D+56.3 |
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 80 seats. Small marks are other seats in California. The black marker is District 21.
Higher than 86% of seats.
Lower than 65% of seats.
Lower than 66% of seats.
Lower than 70% of seats.
Higher than 82% of seats.
Denser than 53% 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 2822% Hispanic · 58% college gradsD+46.5Held DDistrict 23
72% college gradsD+57.4Held DDistrict 51
64% college gradsD+55.0Held DDistrict 19
58% college gradsD+61.6Held 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.
- Diane Papan (D)
2023– · Won 2022 by 44.9, 2024 by 47.7, 2026 by 56.3
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)