U.S. House seat · lines in effect since 2026
California's 40th District
A district of about 798,000 people, 34% Hispanic, 38% of adults with a bachelor's degree. It votes R+11.4 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
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-40.
Higher than 65% of seats.
Lower than 67% of seats.
Higher than 85% of seats.
Lower than 70% of seats.
Higher than 86% of seats.
Denser than 69% 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.
TX-3225% Hispanic · 39% college gradsR+15.2Held RFL-12
28% Hispanic · 34% college gradsR+12.7Held RTX-2
31% Hispanic · 41% college gradsR+22.7Held RFL-14
28% Hispanic · 38% college gradsR+8.5Held 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.
- Ken Calvert (R)
2027– · Won 2026 by 7.9
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)