99chambers

Iowa House of Representatives seat · lines in effect since 2022

Iowa House District 100

A district of about 33,000 people, 22% of adults with a bachelor's degree. It votes R+25.3 relative to the nation for president.

Blaine Watkins (R) · since Mar 11, 2025Next 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+25.364th most
Democratic
Most DemocraticMost Republican51st seat · the majority lineDistrict 100

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.

20222026
Iowa House of RepresentativesR+22.1R+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 100 seats. Small marks are other seats in Iowa. The black marker is District 100.

Adults with a bachelor's degree22% 20th pct · 80th of 100 in IA

Lower than 80% of seats.

White adults without a degree71% 86th pct · 15th of 100 in IA

Higher than 86% of seats.

Hispanic residents3% 27th pct · 73rd of 100 in IA

Lower than 73% of seats.

Black residents2% 55th pct · 46th of 100 in IA

Higher than 55% of seats.

Asian residents1% 17th pct · 83rd of 100 in IA

Lower than 83% of seats.

People per square mile74 44th pct · 56th of 100 in IA

Less dense than 56% 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.

District 38
IowaR+23.2Held RDistrict 84
27% college gradsR+26.7Held RDistrict 68
21% college gradsR+28.9Held RDistrict 66
21% college gradsR+30.2Held R

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. Blaine Watkins (R)
    2026– · Won 2025 by 3.3, 2026 by 9.2
  2. Martin L. Graber (R)
    2023–2026 · Won 2022 by 22.1, 2024 by 35.5

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