2018 United States House of Representatives elections in Iowa

As of 2025, these results were also the last time the Democrats would achieve either due to Iowa's transition into a safe red state.

Results of the 2018 United States House of Representatives elections in Iowa by district:[1] Rod Blum Republican Abby Finkenauer Democratic Incumbent Republican Rod Blum, who had represented the district since 2015, ran for re-election.

[2] Gaff was only 18, meaning he would not have met the U.S. Constitution's required minimum age of 25 to be elected to the House of Representatives.

[2] King declined to debate Scholten during the general election campaign.

[83][84] King won by the slimmest margin of victory in his congressional electoral career.

2018 Iowa's 1st congressional district Republican primary results by county:
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  • Blum—100%
  • Blum—≥90%
2018 Iowa's 1st congressional district Democratic primary results by county:
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  • Finkenauer—80–90%
  • Finkenauer—70–80%
  • Finkenauer—60–70%
  • Finkenauer—50–60%
  • Heckroth—50–60%
2018 Iowa's 2nd congressional district Democratic primary results by county:
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  • Loebsack—100%
  • Loebsack—≥90%
2018 Iowa's 2nd congressional district Republican primary results by county:
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  • Peters—≥90%
  • Peters—80–90%
  • Peters—70–80%
  • Peters—50–60%
2018 Iowa's 3rd congressional district Republican primary results by county:
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  • Young—100%
  • Young—≥90%
2018 Iowa's 3rd congressional district Democratic primary results by county:
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  • Axne—70–80%
  • Axne—60–70%
  • Axne—50–60%
  • Mauro—40–50%
2018 Iowa's 4th congressional district Republican primary results by county:
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  • King—80–90%
  • King—70–80%
  • King—60–70%
2018 Iowa's 4th congressional district Democratic primary results by county:
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  • Scholten—70–80%
  • Scholten—60–70%
  • Scholten—50–60%
  • Scholten—40–50%
  • Scholten—30–40%
  • Jacobsen—40–50%
  • Jacobsen—50–60%
  • Jacobsen—60–70%