Iowa State Senate seat · lines in effect since 2022
Iowa Senate District 21
A district of about 51,000 people, 50% of adults with a bachelor's degree. It votes R+1.5 relative to the nation for president.
Where it sits among all 50 seats
Every Iowa 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.
Democratic
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.
| 2022 | 2026 | |
|---|---|---|
| Iowa State Senate | R+1.9 | D+12.6 |
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 50 seats. Small marks are other seats in Iowa. The black marker is District 21.
Higher than 88% of seats.
Lower than 82% of seats.
Lower than 65% of seats.
Higher than 51% of seats.
Higher than 80% of seats.
Denser than 88% 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 4751% college gradsR+6.9CountingDistrict 14
58% college gradsD+0.2Not up in 2026District 22
48% college gradsD+7.4Not up in 2026District 37
39% college gradsD+12.1Held 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.
- Heather Matson (D)
2027– · Won 2026 by 12.6 - Mike Bousselot (R)
2023–2027 · Won 2022 by 1.9
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)