U.S. House seat · lines in effect since 2026
California's 10th District
A district of about 790,000 people, 21% Hispanic and 21% Asian, 52% of adults with a bachelor's degree. It votes D+35.9 relative to the nation for president.
Source: 2026 results: California Secretary of State; boundaries: Census Bureau TIGER/LineUpdated Nov 7, 2026, 3:01 PM ET
Where it sits among all 435 seats
Every U.S. House 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
Labels below the bar mark 51 other seats in California.
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.
| 2026 | |
|---|---|
| U.S. House | D+39.3 |
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 435 seats. Small marks are other seats in California. The black marker is CA-10.
Higher than 92% of seats.
Lower than 78% of seats.
Higher than 69% of seats.
Lower than 65% of seats.
Higher than 96% of seats.
Denser than 72% 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.
WA-153% college gradsD+30.5Held DNJ-12
23% Hispanic · 49% college gradsD+27.1Held DCA-19
26% Hispanic · 48% college gradsD+36.9Held DCA-30
24% Hispanic · 51% college gradsD+42.3Held 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 2026.
- Mark DeSaulnier (D)
2027– · Won 2026 by 39.3
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)