99chambers

California State Senate seat · lines in effect since 2022

California Senate District 40

A district of about 927,000 people, 27% Hispanic, 46% of adults with a bachelor's degree. It votes D+4.6 relative to the nation for president.

Brian Jones (R) · since Nov 6, 2018Flipped in 2026Next election Nov 5, 2030The 2026 race →

Where it sits among all 40 seats

Every California State Senate 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+4.631st most
Democratic
Most DemocraticMost Republican21st seat · the majority lineDistrict 40

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.

20222026
California State SenateR+6.3D+6.3

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 40 seats. Small marks are other seats in California. The black marker is District 40.

Adults with a bachelor's degree46% 77th pct · 10th of 40 in CA

Higher than 77% of seats.

White adults without a degree26% 79th pct · 9th of 40 in CA

Higher than 79% of seats.

Hispanic residents27% 33rd pct · 27th of 40 in CA

Lower than 67% of seats.

Black residents2% 23rd pct · 31st of 40 in CA

Lower than 77% of seats.

Asian residents17% 62nd pct · 16th of 40 in CA

Higher than 62% of seats.

People per square mile726 36th pct · 26th of 40 in CA

Less dense than 64% 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. 1 of the 4 flipped this year.

District 38
25% Hispanic · 54% college gradsD+14.1Held DDistrict 37
24% Hispanic · 56% college gradsD+9.1Not up in 2026District 36
24% Hispanic · 45% college gradsR+2.9Flipped DDistrict 5
36% Hispanic · 33% college gradsD+11.6Not up in 2026

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.

  1. Mara Elliott (D)
    2027– · Won 2026 by 6.3
  2. Brian W. Jones (R)
    2023–2027 · Won 2022 by 6.3

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