99chambers

Arizona State Senate seat · lines in effect since 2022

Arizona Legislative District 13

A district of about 231,000 people, 21% Hispanic, 47% of adults with a bachelor's degree. It votes R+0.1 relative to the nation for president.

J.D. Mesnard (R) · since Nov 6, 2018Flipped in 2026Next election Nov 7, 2028The 2026 race →

Where it sits among all 30 seats

Every Arizona 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.

R+0.114th most
Democratic
Most DemocraticMost Republican16th seat · the majority lineDistrict 13

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.

202220242026
Arizona State SenateR+3.5R+6.3D+9.9

Outlined: the race for this seat itselfBlank: no race that year

Source: 99chambers results archive: precinct results allocated to current lines; 2026: Arizona Secretary of StateUpdated Nov 7, 2026, 3:01 PM ET

Who lives here, compared

Grey bars show the spread of all 30 seats. Small marks are other seats in Arizona. The black marker is District 13.

Adults with a bachelor's degree47% 83rd pct · 6th of 30 in AZ

Higher than 83% of seats.

White adults without a degree31% 41st pct · 18th of 30 in AZ

Lower than 59% of seats.

Hispanic residents21% 34th pct · 20th of 30 in AZ

Lower than 66% of seats.

Black residents5% 76th pct · 8th of 30 in AZ

Higher than 76% of seats.

Asian residents12% 100th pct · 1st of 30 in AZ

Highest of 30 seats.

People per square mile3,645 79th pct · 7th of 30 in AZ

Denser than 79% 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. 3 of the 4 flipped this year.

District 12
51% college gradsD+16.8Held DDistrict 2
24% Hispanic · 35% college gradsR+4.6Flipped DDistrict 14
50% college gradsR+17.7Flipped DDistrict 4
60% college gradsR+2.5Flipped 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 2022.

  1. Kristie O'Brien (D)
    2027– · Won 2026 by 9.9
  2. J. D. Mesnard (R)
    2023–2027 · Won 2022 by 3.5, 2024 by 6.3

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