99chambers

Arizona State Senate seat · lines in effect since 2022

Arizona Legislative District 12

A district of about 242,000 people, 51% of adults with a bachelor's degree. It votes D+16.8 relative to the nation for president.

Mitzi Epstein (D) · since Nov 8, 2022Next 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.

D+16.811th most
Democratic
Most DemocraticMost Republican16th seat · the majority lineDistrict 12

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.

20222024
Arizona State SenateD+16.3D+16.2

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 12.

Adults with a bachelor's degree51% 93rd pct · 3rd of 30 in AZ

Higher than 93% of seats.

White adults without a degree30% 34th pct · 20th of 30 in AZ

Lower than 66% of seats.

Hispanic residents19% 28th pct · 22nd of 30 in AZ

Lower than 72% of seats.

Black residents5% 72nd pct · 9th of 30 in AZ

Higher than 72% of seats.

Asian residents8% 97th pct · 2nd of 30 in AZ

Higher than 97% of seats.

People per square mile1,871 52nd pct · 15th of 30 in AZ

Denser than 52% 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. 2 of the 4 flipped this year.

District 8
28% Hispanic · 45% college gradsD+22.2Held DDistrict 13
21% Hispanic · 47% college gradsR+0.1Flipped DDistrict 18
22% Hispanic · 46% college gradsD+24.4Held 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. Patty Contreras (D)
    2027– · Won 2026 by 41.1
  2. Denise Epstein (D)
    2023–2027 · Won 2022 by 16.3, 2024 by 16.2

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