99chambers

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

California's 15th District

A district of about 736,000 people, 26% Hispanic and 37% Asian, 49% of adults with a bachelor's degree. It votes D+51.8 relative to the nation for president.

Kevin Mullin (D) · since Jan 3, 2023Next election Nov 7, 2028The 2026 race →
CA-15

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+51.829th most
Democratic
Most DemocraticMost Republican218th seat · the majority line1211373443CA-1516173036442914819101832282425251465041263843194273339149273547321625451348224023520

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+56.9

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-15.

Adults with a bachelor's degree49% 87th pct · 13th of 52 in CA

Higher than 87% of seats.

White adults without a degree12% 9th pct · 44th of 52 in CA

Lower than 91% of seats.

Hispanic residents26% 77th pct · 36th of 52 in CA

Higher than 77% of seats.

Black residents2% 17th pct · 40th of 52 in CA

Lower than 83% of seats.

Asian residents37% 99th pct · 4th of 52 in CA

Higher than 99% of seats.

People per square mile3,219 86th pct · 17th of 52 in CA

Denser than 86% 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.

CA-14
23% Hispanic · 51% college gradsD+38.8Held DCA-16
20% Hispanic · 62% college gradsD+50.9Held DCA-28
28% Hispanic · 47% college gradsD+27.8Held DCA-11
64% college gradsD+72.0Held 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. Kevin Mullin (D)
    2027– · Won 2026 by 56.9

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