Dan Zumbach
Iowa State Senator, District 34 since 2012. Next on the ballot in 2028.
- In office
- 14 yrs
- Since 2012
- Bills became law
- 0
- 8 sponsored, 2025–2026 session
- Votes missed
- 13.6%
- Chamber median 2.9%
- With party
- 100%
- On votes splitting the parties
- Last margin
- +33.5
- Won 2024
- Next election
- 2028
- Nov 7, 2028
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 9:43 AM ET
Committees
As of 2026-10.
- All-Terrain Vehicles and Off-Road Utility Vehicles on Highways Interim · co-chair
- Appropriations · vice chair
- Transportation · chair
- Agriculture
- Capital Projects
- Commerce
- Fiscal
- Fuel Distribution Percentage Formula Review
- Health and Human Services
- Natural Resources and Environment
- Ways and Means
Source: Open States committeesUpdated Oct 27, 2026, 9:43 AM ET
Legislation
No bills in this list for the 2025–2026 session.
Source: Open States billsUpdated Nov 6, 2026, 4:22 PM ET
Voting record
Where Zumbach sits in the Iowa State Senate
Zumbach is closer to the center than 9% of the chamber's Republicans.
Closest: Amy Sinclair, Jack Whitver, Jeff Reichman
Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 4:49 PM ET
With Zumbach’s party
- Votes with the chamber's Republicans100%
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: Zumbach’s vote, each party’s majority, and the result. An orange vote differs from most Republicans.
| Date | Bill | Zumbach | 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 Zumbach 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 State Senate, District 34 | Won | R+33.5 |
| 2020 | Iowa State Senate, District 48 | Won | R+30.3 |
| 2016 | Iowa State Senate, District 48 | Won | R+29.7 |
| 2012 | Iowa State Senate, District 48 | Won | R+1.7 |
Source: 99chambers results archive
Seats Zumbach has held
- Iowa State Senate, District 34 · since 2024
- Iowa State Senate, District 48 · since 2012
Source: 99chambers results archive
Who Zumbach has run against
- Joe Hegland (D) · 2024 general, won
- Eric Green (D) · 2020 general, won
- Scott Peterson (D) · 2016 general, won
- Nate Willems (D) · 2012 general, won
Source: 99chambers results archive
How we know Zumbach
One person, matched across every source we use.
- Open States ocd-person/3fa8bceb-666f-4480-a957-1928e2b5fec6
Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 9:43 AM ET