IA-03 elected a Democrat in 2018.

D+2.2 on 356,241 certified votes. Below: the 2018 result and this district's margin across every cycle on record.

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IA-03 — 2018 result

Source: MIT Election Data + Science Lab, US House returns (party-classified by literal ballot party).

Democratic (D)

175,642

49.3%

Republican (R)

167,933

47.1%

All others

12,666

3.6%

Margin

D+2.2

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Margin history

IA-03 across every cycle on record. Each year links to its district page.

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Year	Won	Margin	Votes
2024	R	−3.8%	412,905
2022	R	−0.7%	310,913
2020	D	+1.4%	447,947
2018	D	+2.2%	356,241
2016	R	−13.7%	390,287
2014	R	−10.5%	282,066
2012	R	−8.6%	386,842
2010	D	+4.2%	240,756
2008	D	+14.3%	313,639
2006	D	+5.4%	223,082
2004	D	+10.5%	304,319
2002	D	+8.4%	215,985
2000	D	+29.1%	248,926
1998	D	+15.8%	189,684
1996	D	+1.7%	234,875
1994	R	−16.8%	193,531
1992	R	−1.9%	257,175
1990	D	+99.2%	101,780
1988	D	+26.7%	203,932
1986	D	+9.2%	152,920
1984	R	−21.4%	220,311
1982	R	−10.9%	187,675
1980	R	−2.9%	209,945
1978	R	−49.6%	138,539
1976	R	−12.9%	208,938