99chambers

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

Iowa's 1st District

A district of about 801,000 people, 33% of adults with a bachelor's degree. It votes R+7.3 relative to the nation for president.

Christina Bohannan (D) · from Jan 3, 2027Flipped in 2026Next election Nov 7, 2028The 2026 race →
IA-1

Source: 2026 results: Iowa 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.

R+7.3230th most
Democratic
Most DemocraticMost Republican218th seat · the majority line3IA-124

Labels below the bar mark 3 other seats in Iowa.

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. HouseR+6.8R+0.2D+9.2

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

Source: 99chambers results archive: precinct results allocated to current lines; 2026: Iowa 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 Iowa. The black marker is IA-1.

Adults with a bachelor's degree33% 47th pct · 2nd of 4 in IA

Lower than 53% of seats.

White adults without a degree58% 88th pct · 3rd of 4 in IA

Higher than 88% of seats.

Hispanic residents6% 20th pct · 3rd of 4 in IA

Lower than 80% of seats.

Black residents4% 30th pct · 2nd of 4 in IA

Lower than 70% of seats.

Asian residents2% 35th pct · 2nd of 4 in IA

Lower than 65% of seats.

People per square mile73 17th pct · 2nd of 4 in IA

Less dense than 83% 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.

MN-1
32% college gradsR+11.6CountingIA-2
29% college gradsR+8.7Flipped DWA-5
32% college gradsR+11.1Held RNC-11
36% college gradsR+10.3Flipped 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. Christina Bohannan (D)
    2027– · Won 2026 by 9.2
  2. Mariannette Miller-Meeks (R)
    2023–2027 · Won 2022 by 6.8, 2024 by 0.2

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