Iowa State Senate District 12
Next vote Tue, Nov 3, 2026 · Represented by Amy Sinclair Republican · Member list as of Oct 28
This seat has no race on the official 2026 list.
- Last election
- Amy Sinclair (Republican) won by 40.9 points, 2024
More about this seat
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- Republican
- Independent
- Nonpartisan
- More than one party
- No member listed
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History (16 elections for this seat)
- Votes for listed candidates
- 32,800
- Election day
- November 5, 2024
- District map
- Older district map (2022 to 2024)
Iowa Senate District 12, 1968 to 2024, 2024, every candidate Candidate Party Votes and share Share RepublicanAmy SinclairWon Republican 23,07570.3% DemocraticNicole Loew Democratic 9,68229.5% Scattered write-ins Write-in 430.1% - Votes for listed candidates
- 29,215
- Election day
- November 3, 2020
- District map
- Older district map (2012 to 2021)
Iowa Senate District 12, 1968 to 2024, 2020, every candidate Candidate Party Votes and share Share RepublicanMark CostelloWon(incumbent) Republican 20,16569.0% DemocraticJoseph Norris Democratic 8,99930.8% Scattered write-ins Write-in 510.2% - Votes for listed candidates
- 25,582
- Election day
- November 8, 2016
- District map
- Older district map (2012 to 2021)
Iowa Senate District 12, 1968 to 2024, 2016, every candidate Candidate Party Votes and share Share RepublicanMark CostelloWon Republican 20,01278.2% LibertarianDon W. Brantz Libertarian 5,52421.6% Scattered write-ins Write-in 460.2% - Votes for listed candidates
- 22,415
- Election day
- November 6, 2012
- District map
- Older district map (2012 to 2021)
Iowa Senate District 12, 1968 to 2024, 2012, every candidate Candidate Party Votes and share Share RepublicanJoni K. ErnstWon Republican 22,20599.1% Scattered write-ins Write-in 2100.9% - Votes for listed candidates
- 27,043
- Election day
- November 4, 2008
- District map
- Older district map (2002 to 2011)
Iowa Senate District 12, 1968 to 2024, 2008, every candidate Candidate Party Votes and share Share DemocraticBrian SchoenjahnWon(incumbent) Democratic 17,40264.3% RepublicanRebecca Wearmouth Republican 9,64135.6% - Votes for listed candidates
- 27,800
- Election day
- November 2, 2004
- District map
- Older district map (2002 to 2011)
Iowa Senate District 12, 1968 to 2024, 2004, every candidate Candidate Party Votes and share Share DemocraticBrian H. SchoenjahnWon Democratic 14,67752.8% RepublicanRon Longmuir Republican 13,12347.2% - Votes for listed candidates
- 25,324
- Election day
- November 7, 2000
- District map
- Older district map (1992 to 2001)
Iowa Senate District 12, 1968 to 2024, 2000, every candidate Candidate Party Votes and share Share RepublicanDonald B. RedfernWon(incumbent) Republican 15,07759.5% DemocraticJohn A. Padget Jr. Democratic 10,24740.5% - Votes for listed candidates
- 23,978
- Election day
- November 5, 1996
- District map
- Older district map (1992 to 2001)
Iowa Senate District 12, 1968 to 2024, 1996, every candidate Candidate Party Votes and share Share RepublicanDonald B. RedfernWon Republican 13,69257.1% DemocraticMichael James Carroll Democratic 10,28642.9% - Votes for listed candidates
- 14,318
- Election day
- November 3, 1992
- District map
- Older district map (1992 to 2001)
Iowa Senate District 12, 1968 to 2024, 1992, every candidate Candidate Party Votes and share Share RepublicanJerry SlafeWon Republican 14,318100.0% - Votes for listed candidates
- 23,393
- Election day
- November 8, 1988
- District map
- Older district map (1982 to 1991)
Iowa Senate District 12, 1968 to 2024, 1988, every candidate Candidate Party Votes and share Share RepublicanJoy CorningWon(incumbent) Republican 12,34652.8% DemocraticRose Angel Democratic 11,04247.2% Scattered write-ins Write-in 50.0% - Votes for listed candidates
- 27,325
- Election day
- November 6, 1984
- District map
- Older district map (1982 to 1991)
Iowa Senate District 12, 1968 to 2024, 1984, every candidate Candidate Party Votes and share Share RepublicanJoy CorningWon Republican 13,81350.5% DemocraticTed Anderson(incumbent) Democratic 13,51149.5% Scattered write-ins Write-in 10.0% - Votes for listed candidates
- 21,624
- Election day
- November 4, 1980
- District map
- Older district map (1972 to 1981)
Iowa Senate District 12, 1968 to 2024, 1980, every candidate Candidate Party Votes and share Share RepublicanMerlin D. HulseWon(incumbent) Republican 13,40762.0% DemocraticMichael L. Richards Democratic 8,21738.0% - Votes for listed candidates
- 23,031
- Election day
- November 2, 1976
- District map
- Older district map (1972 to 1981)
Iowa Senate District 12, 1968 to 2024, 1976, every candidate Candidate Party Votes and share Share RepublicanMerlin D. HulseWon Republican 12,50354.3% DemocraticPaul Ponder Democratic 10,52845.7% - Votes for listed candidates
- 21,303
- Election day
- November 7, 1972
- District map
- Older district map (1972 to 1981)
Iowa Senate District 12, 1968 to 2024, 1972, every candidate Candidate Party Votes and share Share RepublicanClifton C. LambornWon(incumbent) Republican 13,02561.1% DemocraticBarbara Marland Democratic 8,27838.9% - Votes for listed candidates
- 12,839
- Election day
- November 3, 1970
- District map
- Older district map (1970 to 1971)
Iowa Senate District 12, 1968 to 2024, 1970, every candidate Candidate Party Votes and share Share RepublicanAlden J. ErskineWon(incumbent) Republican 6,77852.8% DemocraticAlbert H. Gray Democratic 5,74244.7% OtherLee E. Smith Other 3192.5% - Votes for listed candidates
- 17,018
- Election day
- November 5, 1968
- District map
- Older district map (1966 to 1969)
Iowa Senate District 12, 1968 to 2024, 1968, every candidate Candidate Party Votes and share Share RepublicanJoseph B. FlattWon(incumbent) Republican 11,14665.5% DemocraticJay E. Howe Democratic 5,87234.5%
- 2024: MEDSL 2024 official precinct returns (individual_states zips), retrieved Oct 28, 2026. Compiled by MIT Election Data and Science Lab (MEDSL) from official returns; not an official source
- 1968 to 2020: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), retrieved Oct 28, 2026. Compiled by Carl Klarner (Harvard Dataverse) from official returns; not an official source
Only part of this chamber is up in a given cycle. Which districts vote on which date is not on file. Last contest in this district on file: 2024.
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Cite this page
Election Wrld. (2026). Iowa State Senate District 12, election results 1968 to 2024. https://www.electionwrld.com/ia/senate/12. Retrieved October 31, 2026.
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<iframe src="https://www.electionwrld.com/embed/ia/senate/12" title="Iowa Senate District 12" width="100%" height="400" style="border:0;max-width:640px" loading="lazy"></iframe>
<p style="font-size:13px">Data: <a href="https://www.electionwrld.com">Election Wrld</a>, CC BY 4.0</p>Sources
Sources: Census TIGERweb Legislative MapServer (120th CDs layer 0, 119th CDs layer 4, 2026 SLD upper layer 1 and lower layer 2) (US Census Bureau, public domain), retrieved Oct 28, 2026; Open Civic Data division identifiers (census_autogenerated us_sldl/us_sldu and openstates state files); also (sld-recent.json): Open Civic Data division identifiers (country-us) (CC0 (repository); also (sld-recent.json): CC0 1.0), retrieved Oct 28, 2026; Open States people (current) CSVs (CC0-1.0 (Open States people data)), retrieved Oct 28, 2026, compiled by Open States volunteers and staff (rosters from state legislature sites) from official returns, not an official source; MEDSL 2024 official precinct returns (individual_states zips) (Not stated in the GitHub repository (an earlier label said "MIT (repo)", which the repository does not support). MEDSL's Harvard Dataverse records are CC0 1.0, but these GitHub files were not checksum-matched to the Dataverse files, so CC0 is not claimed for them.), retrieved Oct 28, 2026, compiled by MIT Election Data and Science Lab (MEDSL) from official returns, not an official source; State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse) (CC0 1.0), retrieved Oct 28, 2026, compiled by Carl Klarner (Harvard Dataverse) from official returns, not an official source.
District id: ocd-division/country:us/state:ia/sldu:12
DataState data (JSON)Sources: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), MEDSL 2024 official precinct returnsData as of Oct 28, 2026