99chambers

Iowa House of Representatives seat · lines in effect since 2022

Iowa House District 40

A district of about 41,000 people, 34% of adults with a bachelor's degree. It votes R+6.8 relative to the nation for president.

Bill Gustoff (R) · since Nov 8, 2022Flipped in 2026Next election Nov 7, 2028The 2026 race →

Where it sits among all 100 seats

Every Iowa House of Representatives 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+6.840th most
Democratic
Most DemocraticMost Republican51st 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.

202220242026
Iowa House of RepresentativesR+3.3R+1.9D+8.8

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

Adults with a bachelor's degree34% 69th pct · 32nd of 100 in IA

Higher than 69% of seats.

White adults without a degree56% 38th pct · 62nd of 100 in IA

Lower than 62% of seats.

Hispanic residents6% 57th pct · 44th of 100 in IA

Higher than 57% of seats.

Black residents6% 77th pct · 24th of 100 in IA

Higher than 77% of seats.

Asian residents2% 59th pct · 42nd of 100 in IA

Higher than 59% of seats.

People per square mile1,096 72nd pct · 29th of 100 in IA

Denser than 72% 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 42
42% college gradsR+0.3Held DDistrict 72
35% college gradsEvenFlipped DDistrict 71
37% college gradsD+9.8Held DDistrict 73
36% college gradsD+7.1Held 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. Heather Sievers (D)
    2027– · Won 2026 by 8.8
  2. Bill Gustoff (R)
    2023–2027 · Won 2022 by 3.3, 2024 by 1.9

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