99chambers

U.S. House seat · lines in effect since 2022

Arizona's 3rd District

A district of about 810,000 people, 63% Hispanic, 21% of adults with a bachelor's degree. It votes D+43.1 relative to the nation for president.

Yassamin Ansari (D) · since Jan 3, 2025Next election Nov 7, 2028The 2026 race →
AZ-3

Source: 2026 results: Arizona 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+43.145th most
Democratic
Most DemocraticMost Republican218th seat · the majority lineAZ-374612859

Labels below the bar mark 8 other seats in Arizona.

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
U.S. HouseD+53.9D+44.3D+85.5

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 435 seats. Small marks are other seats in Arizona. The black marker is AZ-3.

Adults with a bachelor's degree21% 4th pct · 9th of 9 in AZ

Lower than 96% of seats.

White adults without a degree15% 14th pct · 9th of 9 in AZ

Lower than 86% of seats.

Hispanic residents63% 95th pct · 1st of 9 in AZ

Higher than 95% of seats.

Black residents10% 62nd pct · 1st of 9 in AZ

Higher than 62% of seats.

Asian residents2% 32nd pct · 6th of 9 in AZ

Lower than 68% of seats.

People per square mile3,922 89th pct · 2nd of 9 in AZ

Denser than 89% 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.

TX-20
69% Hispanic · 22% college gradsD+32.3Held DIL-4
66% Hispanic · 25% college gradsD+33.5Held DCA-29
63% Hispanic · 26% college gradsD+39.0Held DCA-44
71% HispanicD+40.8Held 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. Yassamin Ansari (D)
    2025– · Won 2024 by 44.3, 2026 by 80.6
  2. Ruben Gallego (D)
    2023–2025 · Won 2022 by 53.9

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