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Legislators › House

Rep. Zach Dieken

Republican · House District 5 · O’Brien

In office since 2023 · 2 General Assemblies

Get their floor votes and new bills they sponsor. Votes against their party come right away.

zachary.dieken@legis.iowa.gov

Official profile
980
floor votes cast
20%
of votes missed (245)
96%
voted with their party’s majority · broke with it 39 times
193 of 208
party-line votes with their party (when the two parties split)

24 of their 39 breaks with their party came on bipartisan votes, where most of both parties voted the same way, so they don’t count against the party-line record.

Votes most like

How often they voted the same way (yes or no) as each House colleague in the 2026 session. How it’s worked out

Closest across the aisle: Lindsay James (D), 86%.

Lobbying groups they vote with

Rep. Zach Dieken’s contested votes in the 2026 session, compared with the sides 74 organizations registered on those bills.

Most often

Each legislator’s last floor vote on a bill is compared with the side the organization registered on it (its latest declaration; undecided doesn’t count). Only contested votes count, where at least a tenth of the chamber voted the other way, since most bills pass nearly unanimously. A vote on an amended bill may not be the version that was lobbied. Organizations with fewer than 3 such votes aren’t listed. Lining up with a group doesn’t mean it swayed the vote.

Recent votes

All 1225 votes →

Votes against their party

  • HF 2779 A bill for an act relating to authorizations to conduct advance deposit wagering.(Formerly HSB 757 .…
    April 21, 2026 · voted no; Republicans voted 57–8 · Roll call
    No
  • SF 2320 A bill for an act modifying provisions related to the district-to-community college sharing or concu…
    April 14, 2026 · voted no; Republicans voted 64–1 · Roll call
    No
  • SF 2299 A bill for an act relating to the district-to-community college sharing or concurrent enrollment pro…
    April 14, 2026 · voted no; Republicans voted 60–5 · Roll call
    No
  • SF 563 A bill for an act relating to the licensure of crematory operators and funeral establishments, and m…
    March 24, 2026 · voted no; Republicans voted 58–7 · Roll call
    No
  • HF 2297 A bill for an act relating to radon mitigation in residential buildings. (Formerly HF 82 .) Effectiv…
    March 12, 2026 · voted no; Republicans voted 59–4 · Roll call
    No
  • HF 2329 A bill for an act relating to interest rates and charges on regulated loans, and consumer credit tra…
    March 12, 2026 · voted no; Republicans voted 59–4 · Roll call
    No
  • HF 2624 A bill for an act relating to criminal investigation, including the extension of DNA submission requ…
    March 10, 2026 · voted no; Republicans voted 55–9 · Roll call
    No
  • HF 2564 A bill for an act relating to a pregnant minor’s legal capacity to consent to the provision of certa…
    March 4, 2026 · voted no; Republicans voted 63–2 · Roll call
    No
  • HF 2628 A bill for an act relating to the driving privileges of persons under the age of eighteen who were p…
    March 4, 2026 · voted no; Republicans voted 62–4 · Roll call
    No
  • HF 2493 A bill for an act relating to the statewide preschool program by modifying provisions relating to el…
    February 26, 2026 · voted no; Republicans voted 60–2 · Roll call
    No
  • SJR 9 A joint resolution proposing an amendment to the Constitution of the State of Iowa relating to the r…
    April 17, 2025 · voted no; Republicans voted 60–3 · Roll call
    No
  • SF 167 A bill for an act relating to school funding by establishing the state percent of growth and the cat…
    April 8, 2025 · voted no; Republicans voted 60–6 · Roll call
    No
  • SF 588 A bill for an act concerning local government notice requirements on certain actions. (Formerly SSB …
    April 8, 2025 · voted no; Republicans voted 58–8 · Roll call
    No
  • HF 956 A bill for an act relating to judicial branch administration, including judicial officer residency, …
    March 27, 2025 · voted no; Republicans voted 55–6 · Roll call
    No
  • HF 766 A bill for an act relating to motor vehicle window tint, and making penalties applicable. (Formerly …
    March 25, 2025 · voted no; Republicans voted 52–13 · Roll call
    No
  • HF 524 A bill for an act relating to the regulation of tanning facilities, and making penalties applicable.…
    March 17, 2025 · voted no; Republicans voted 53–12 · Roll call
    No
  • HF 644 A bill for an act relating to the delegation of custodial rights and duties with respect to a child.…
    March 13, 2025 · voted no; Republicans voted 60–4 · Roll call
    No
  • HF 579 A bill for an act relating to certain amounts of school district funding for programs for at-risk st…
    March 12, 2025 · voted no; Republicans voted 60–4 · Roll call
    No
  • HF 523 A bill for an act relating to the ability of peace officers to file a petition for emergency protect…
    March 12, 2025 · voted no; Republicans voted 59–5 · Roll call
    No
  • HF 393 A bill for an act relating to the Iowa school performance profiles published by the department of ed…
    March 11, 2025 · voted no; Republicans voted 60–2 · Roll call
    No
  • SF 167 A bill for an act relating to school funding by establishing the state percent of growth and the cat…
    February 13, 2025 · voted no; Republicans voted 58–5 · Roll call
    No
  • SF 2385 A bill for an act relating to boards, commissions, committees, councils, and other entities of state…
    April 16, 2024 · voted no; Republicans voted 54–8 · Roll call
    No
  • HF 555 A bill for an act relating to the practice of pharmacy, and providing for administrative penalties. …
    April 3, 2024 · voted no; Republicans voted 53–9 · Roll call
    No
  • HF 2612 A bill for an act relating to education, including modifying provisions related to the duties and po…
    March 21, 2024 · voted no; Republicans voted 51–9 · Roll call
    No
  • HF 2547 A bill for an act relating to education, including by requiring school engagement meetings and atten…
    March 12, 2024 · voted no; Republicans voted 56–8 · Roll call
    No
  • HF 2401 A bill for an act relating to pharmacy benefits managers, pharmacies, and prescription drug pricing,…
    March 12, 2024 · voted no; Republicans voted 61–3 · Roll call
    No
  • SF 455 A bill for an act relating to the regulation of topsoil and storm water at construction sites. (Form…
    March 11, 2024 · voted no; Republicans voted 53–10 · Roll call
    No
  • HF 2575 A bill for an act relating to the nonconsensual causing of death of, or serious injury to, an unborn…
    March 7, 2024 · voted no; Republicans voted 58–3 · Roll call
    No
  • HF 2601 A bill for an act relating to public parking meters. (Formerly HSB 669 .)
    March 6, 2024 · voted no; Republicans voted 52–8 · Roll call
    No
  • HF 2568 A bill for an act relating to nonvehicular traffic, including pedestrian conveyances and bicyclists’…
    February 29, 2024 · voted no; Republicans voted 52–8 · Roll call
    No
  • HF 2612 A bill for an act relating to education, including modifying provisions related to the duties and po…
    February 29, 2024 · voted no; Republicans voted 53–9 · Roll call
    No
  • HF 591 A bill for an act relating to the midwest interstate passenger rail compact, and including effective…
    February 19, 2024 · voted no; Republicans voted 51–6 · Roll call
    No
  • HF 732 A bill for an act prohibiting and requiring certain actions relating to abortion involving the detec…
    July 11, 2023 · voted no; Republicans voted 56–2 · Roll call
    No
  • HF 675 A bill for an act relating to money transmission services. (Formerly HF 431 , HSB 128 .) Effective d…
    April 11, 2023 · voted no; Republicans voted 60–3 · Roll call
    No
  • HF 602 A bill for an act relating to the inclusion of the crisis hotline telephone and text numbers and int…
    March 22, 2023 · voted no; Republicans voted 57–4 · Roll call
    No
  • HF 555 A bill for an act relating to the practice of pharmacy, and providing for administrative penalties. …
    March 16, 2023 · voted no; Republicans voted 52–10 · Roll call
    No
  • SF 514 A bill for an act relating to the organization, structure, and functions of state government, provid…
    March 15, 2023 · voted no; Republicans voted 58–5 · Roll call
    No
  • HF 161 A bill for an act relating to damage awards against health care providers, creating a medical error …
    February 8, 2023 · voted no; Republicans voted 53–11 · Roll call
    No
  • HR 3 A resolution relating to permanent rules of the House of Representatives for the Ninetieth General A…
    January 23, 2023 · voted no; Republicans voted 58–5 · Roll call
    No