Iowa State Senate District 10

Next vote Tue, Nov 3, 2026 · Represented by Dan Dawson Republican · Member list as of Oct 28

This seat has no race on the official 2026 list.

Last election: Dan Dawson (Republican) won by 12.1 points, 2024

More about this seat

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Official results for Iowa

History (15 elections for this seat)

Votes for listed candidates: 24,709
Election day: November 5, 2024
District map: Older district map (2022 to 2024)

Iowa Senate District 10, 1968 to 2024, 2024, every candidate
Candidate	Party	Votes and share	Share
RepublicanDan DawsonWon	Republican	13,84056.0%	56.0%
DemocraticSteve Gorman	Democratic	10,84243.9%	43.9%
Scattered write-ins	Write-in	270.1%	0.1%

Votes for listed candidates: 39,291
Election day: November 3, 2020
District map: Older district map (2012 to 2021)

Iowa Senate District 10, 1968 to 2024, 2020, every candidate
Candidate	Party	Votes and share	Share
RepublicanJake ChapmanWon(incumbent)	Republican	24,53862.5%	62.5%
DemocraticWarren Andrew Varley	Democratic	14,70437.4%	37.4%
Scattered write-ins	Write-in	490.1%	0.1%

Votes for listed candidates: 30,112
Election day: November 8, 2016
District map: Older district map (2012 to 2021)

Iowa Senate District 10, 1968 to 2024, 2016, every candidate
Candidate	Party	Votes and share	Share
RepublicanJake ChapmanWon(incumbent)	Republican	20,05366.6%	66.6%
DemocraticMatt Paladino	Democratic	10,00633.2%	33.2%
Scattered write-ins	Write-in	530.2%	0.2%

Iowa Senate District 10, 1968 to 2024, 2012, every candidate
Candidate	Party	Votes and share	Share
RepublicanJake ChapmanWon	Republican	22,59497.9%	97.9%
Scattered write-ins	Write-in	4802.1%	2.1%

Votes for listed candidates: 32,184
Election day: November 4, 2008
District map: Older district map (2002 to 2011)

Iowa Senate District 10, 1968 to 2024, 2008, every candidate
Candidate	Party	Votes and share	Share
DemocraticJeff DanielsonWon(incumbent)	Democratic	16,10350.0%	50.0%
RepublicanWalt Rogers	Republican	16,08150.0%	50.0%

Iowa Senate District 10, 1968 to 2024, 2004, every candidate
Candidate	Party	Votes and share	Share
DemocraticJeff DanielsonWon	Democratic	16,71253.9%	53.9%
RepublicanFrank Dowie	Republican	14,28146.1%	46.1%

Votes for listed candidates: 26,093
Election day: November 7, 2000
District map: Older district map (1992 to 2001)

Iowa Senate District 10, 1968 to 2024, 2000, every candidate
Candidate	Party	Votes and share	Share
RepublicanMerlin E. BartzWon(incumbent)	Republican	16,94865.0%	65.0%
DemocraticJerry Theilen	Democratic	9,14535.0%	35.0%

Votes for listed candidates: 24,371
Election day: November 5, 1996
District map: Older district map (1992 to 2001)

Iowa Senate District 10, 1968 to 2024, 1996, every candidate
Candidate	Party	Votes and share	Share
RepublicanMerlin E. BartzWon(incumbent)	Republican	15,03161.7%	61.7%
DemocraticRobert Perry	Democratic	9,34038.3%	38.3%

Iowa Senate District 10, 1968 to 2024, 1992, every candidate
Candidate	Party	Votes and share	Share
RepublicanMerlin E. BartzWon	Republican	15,09854.5%	54.5%
DemocraticJohn Croninga	Democratic	12,63245.5%	45.5%

Votes for listed candidates: 25,469
Election day: November 8, 1988
District map: Older district map (1982 to 1991)

Iowa Senate District 10, 1968 to 2024, 1988, every candidate
Candidate	Party	Votes and share	Share
DemocraticAlvin V. MillerWon(incumbent)	Democratic	13,34152.4%	52.4%
RepublicanJack Knapp	Republican	12,12847.6%	47.6%

Votes for listed candidates: 26,253
Election day: November 6, 1984
District map: Older district map (1982 to 1991)

Iowa Senate District 10, 1968 to 2024, 1984, every candidate
Candidate	Party	Votes and share	Share
DemocraticAlvin V. MillerWon(incumbent)	Democratic	14,46455.1%	55.1%
RepublicanDon Morrison	Republican	11,78744.9%	44.9%
Scattered write-ins	Write-in	20.0%	0.0%

Votes for listed candidates: 22,947
Election day: November 4, 1980
District map: Older district map (1972 to 1981)

Iowa Senate District 10, 1968 to 2024, 1980, every candidate
Candidate	Party	Votes and share	Share
DemocraticBob CarrWon(incumbent)	Democratic	12,58854.9%	54.9%
RepublicanJohn M. Walsh	Republican	10,35945.1%	45.1%

Iowa Senate District 10, 1968 to 2024, 1976, every candidate
Candidate	Party	Votes and share	Share
DemocraticBob CarrWon	Democratic	14,30862.6%	62.6%
RepublicanMarian B. Praff	Republican	8,54537.4%	37.4%

Votes for listed candidates: 23,253
Election day: November 7, 1972
District map: Older district map (1972 to 1981)

Iowa Senate District 10, 1968 to 2024, 1972, every candidate
Candidate	Party	Votes and share	Share
DemocraticMichael T. BlouinWon	Democratic	12,50053.8%	53.8%
RepublicanJohn M. Walsh(incumbent)	Republican	10,75346.2%	46.2%

Votes for listed candidates: 15,605
Election day: November 5, 1968
District map: Older district map (1966 to 1969)

Iowa Senate District 10, 1968 to 2024, 1968, every candidate
Candidate	Party	Votes and share	Share
DemocraticBass VangilstWon(incumbent)	Democratic	7,86150.4%	50.4%
RepublicanLake M. Crookham	Republican	7,74449.6%	49.6%

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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Election Wrld. (2026). Iowa State Senate District 10, election results 1968 to 2024. https://www.electionwrld.com/ia/senate/10. Retrieved October 30, 2026.

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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:10

DataState data (JSON)Sources: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), MEDSL 2024 official precinct returnsData as of Oct 28, 2026