Zach Dieken
Iowa State Representative, District 5 since 2022. Did not run for re-election in 2026; leaves office in January 2027.
- In office
- 3 yrs
- Since 2022
- Bills became law
- 0
- 34 sponsored, 2025–2026 session
- Votes missed
- 33.9%
- Chamber median 3.8%
- With party
- 96%
- On votes splitting the parties
- Last margin
- +56.1
- Won 2024
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 9:43 AM ET
Committees
As of 2026-10.
- Environmental Protection
- Public Safety
Source: Open States committeesUpdated Oct 27, 2026, 9:43 AM ET
Legislation
college of veterinary medicine · Failed in the House Apr 2026
emergency management · Failed in the House Mar 2026
athletics · Failed in the House Mar 2026
human trafficking · Failed in the House Mar 2026
immunizations · Failed in the House Feb 2026
Source: Open States billsUpdated Nov 6, 2026, 4:22 PM ET
Voting record
Where Dieken sits in the Iowa House of Representatives
Dieken is closer to the center than 69% of the chamber's Republicans.
Closest: Jane Bloomingdale, , Bill Gustoff
Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 4:49 PM ET
With Dieken’s party
- Votes with the chamber's Republicans96%
Black tick: the average of Republicans in the Iowa House of Representatives.
Source: 99chambers legislative scores from roll calls and cosponsorships
Key votes
Votes chosen for their effect, not their side: Dieken’s vote, each party’s majority, and the result. An orange vote differs from most Republicans.
| Date | Bill | Dieken | Rep. majority | Dem. majority | Result |
|---|---|---|---|---|---|
| May 2, 2026 | HF 2542: A bill for an act relating to habitual offenders, and providing penalties. | Not voting | Yes | No | Passed 66–20 |
| May 2, 2026 | SF 2490: A bill for an act relating to oil and gas production, including filing requirements, the… | Not voting | Yes | No | Passed 65–21 |
| May 2, 2026 | HF 2771: A bill for an act relating to and making appropriations involving state government… | Not voting | Yes | No | Passed 66–18 |
| May 2, 2026 | SF 2472: A bill for an act relating to state and local government taxes, fees, financial… | Not voting | Yes | No | Passed 62–22 |
| Apr 29, 2026 | SF 2218: A bill for an act relating to state regulatory compliance and eligibility requirements,… | Not voting | Yes | No | Passed 71–20 |
Source: 99chambers key votes from Congress.gov, Voteview and Open States roll calls
Career
Offices held, and every time Dieken 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 |
|---|---|---|---|
| 2024 | Iowa House of Representatives, District 5 | Won | R+56.1 |
| 2022 | Iowa House of Representatives, District 5 | Won | — |
Source: 99chambers results archive
Seats Dieken has held
- Iowa House of Representatives, District 5 · since 2022
Source: 99chambers results archive
Who Dieken has run against
- Michael Schnoes (I) · 2024 general, won
Source: 99chambers results archive
How we know Dieken
One person, matched across every source we use.
- Open States ocd-person/ef26d757-2882-4047-a82e-0682cc638d05
Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 9:43 AM ET