Ken Rozenboom
Iowa State Senator, District 19 since 2012. Did not run for re-election in 2026; leaves office in January 2027.
- In office
- 14 yrs
- Since 2012
- Bills became law
- 1
- 5 sponsored, 2025–2026 session
- Votes missed
- 0.7%
- Chamber median 2.9%
- With party
- 99%
- On votes splitting the parties
- Last margin
- +37.3
- Won 2022
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 9:43 AM ET
Committees
As of 2026-10.
- Agriculture · vice chair
- School Finance Formula Review · co-chair
- State Government · chair
- State Government Efficiency Review · co-chair
- Education
- Legislative Council
- Natural Resources and Environment
- Rules and Administration
- Studies
- Transportation
Source: Open States committeesUpdated Oct 27, 2026, 9:43 AM ET
Legislation
cellular phones · Became law Apr 2025
health insurance · Failed in the Senate Feb 2025
agriculture · Failed in committee Jan 2026
Source: Open States billsUpdated Nov 6, 2026, 4:22 PM ET
Voting record
Where Rozenboom sits in the Iowa State Senate
Rozenboom is closer to the center than 48% of the chamber's Republicans.
Closest: Mike Bousselot, Dan Dawson, Kara Warme
Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 4:49 PM ET
With Rozenboom’s party
- Votes with the chamber's Republicans99%
Black tick: the average of Republicans in the Iowa State Senate.
Source: 99chambers legislative scores from roll calls and cosponsorships
Key votes
Votes chosen for their effect, not their side: Rozenboom’s vote, each party’s majority, and the result. An orange vote differs from most Republicans.
| Date | Bill | Rozenboom | Rep. majority | Dem. majority | Result |
|---|---|---|---|---|---|
| Oct 2, 2026 | HF 2801: A bill for an act modifying the major economic growth attraction program, and including… | Yes | Yes | No | Passed 28–19 |
| May 2, 2026 | HF 2770: A bill for an act relating to and making appropriations to the justice system, providing… | Yes | Yes | No | Passed 29–17 |
| May 2, 2026 | HF 2787: A bill for an act prohibiting warrant resolution clinics, including enforcement… | Yes | Yes | No | Passed 31–12 |
| May 2, 2026 | SF 2490: A bill for an act relating to oil and gas production, including filing requirements, the… | Yes | Yes | No | Passed 35–11 |
| May 2, 2026 | HF 2781: A bill for an act relating to allocations of moneys from the juvenile detention home fund. | Yes | Yes | No | Passed 34–9 |
Source: 99chambers key votes from Congress.gov, Voteview and Open States roll calls
Career
Offices held, and every time Rozenboom was on a ballot. Filled marks are general elections won; hollow marks are primaries; an orange outline is a loss.
Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Elections
Margin against the seat’s presidential baseline: how the seat voted for president in the same or nearest year.
| Year | Race | Result | Margin |
|---|---|---|---|
| 2022 | Iowa State Senate, District 19 | Won | R+37.3 |
| 2020 | Iowa State Senate, District 40 | Won | R+43.1 |
| 2016 | Iowa State Senate, District 40 | Won | — |
| 2012 | Iowa State Senate, District 40 | Won | R+20.3 |
Source: 99chambers results archive
Seats Rozenboom has held
- Iowa State Senate, District 19 · since 2022
- Iowa State Senate, District 40 · since 2012
Source: 99chambers results archive
Who Rozenboom has run against
- Tyler Stewart (D) · 2022 general, won
- Lance Roorda (D) · 2020 general, won
- Tim Tripp (D) · 2012 general, won
Source: 99chambers results archive
How we know Rozenboom
One person, matched across every source we use.
- Open States ocd-person/1cfc824d-740a-4e35-a4e2-3728e2d43056
Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 9:43 AM ET