99chambers

U.S. House seat · lines in effect since 2026

California's 45th District

A district of about 747,000 people, 35% Hispanic and 39% Asian, 35% of adults with a bachelor's degree. It votes D+5.6 relative to the nation for president.

Derek Tran (D) · since Jan 3, 2025Next election Nov 7, 2028The 2026 race →
CA-45

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.

D+5.6185th most
Democratic
Most DemocraticMost Republican218th seat · the majority line12113734431516173036442914819101832282425251465041263843194273339149273547321625CA-451348224023520

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. HouseD+20.0

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-45.

Adults with a bachelor's degree35% 54th pct · 24th of 52 in CA

Higher than 54% of seats.

White adults without a degree13% 12th pct · 35th of 52 in CA

Lower than 88% of seats.

Hispanic residents35% 85th pct · 26th of 52 in CA

Higher than 85% of seats.

Black residents2% 16th pct · 41st of 52 in CA

Lower than 84% of seats.

Asian residents39% 99th pct · 3rd of 52 in CA

Higher than 99% of seats.

People per square mile7,512 95th pct · 6th of 52 in CA

Denser than 95% 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.

NY-6
26% Hispanic · 38% college gradsD+12.3Held DCA-28
28% Hispanic · 47% college gradsD+27.8Held DCA-38
58% Hispanic · 29% college gradsD+16.7Held DHI-1
40% college gradsD+26.4Held 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.

  1. Derek Tran (D)
    2027– · Won 2026 by 20.0

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)