Iowa Congressional District 04

Congressional District Profile

Overview

District ID
IA-04
State
Iowa
District Number
04
Total Candidates
84
Election Cycles
2026, 2024, 2022, 2020, 2018, 2016, 2014, 2012, 2010, 2008, 2006, 2004, 2002, 2000, 1998, 1996, 1994, 1992, 1990, 1988, 1986, 1984, 1982, 1980

View office details for U.S. Representative - Iowa District 04

Voters

Registered Voters
513,303
Active Voters
430,444 (83.9%)

Party Registration

PartyVotersShare
Democratic109,39221.3%
Republican232,24445.2%
Unaffiliated166,96132.5%
Other parties4,7060.9%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–2026110,287 (21.5%)0 (0.0%)0 (0.0%)
2023–2024392,352 (76.4%)6,676 (1.3%)45,516 (8.9%)
2021–2022276,695 (53.9%)21,595 (4.2%)54,649 (10.6%)
2019–2020365,240 (71.2%)42,509 (8.3%)77,883 (15.2%)
2017–2018269,232 (52.5%)24,245 (4.7%)32,538 (6.3%)
2015–2016299,451 (58.3%)10,633 (2.1%)36,686 (7.1%)
2013–2014207,955 (40.5%)7,788 (1.5%)35,719 (7.0%)
2011–2012263,892 (51.4%)6,296 (1.2%)32,183 (6.3%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

Browse the voter list for this district (premium access; sign-in required)

Source: Civitech voter file snapshot as of 01/20/2026. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Citizen Population
765,779
Citizen Voting Age Population (CVAP)
587,041

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic702,38491.7%
Hispanic63,3958.3%
White657,17785.8%
Black13,3741.7%
Asian9,7681.3%
American Indian / Alaska Native2,3420.3%
Native Hawaiian / Pacific Islander1,2980.2%
Two or More Races1,7500.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic553,21094.2%
Hispanic33,8305.8%
White523,82289.2%
Black12,7752.2%
Asian9,7611.7%
American Indian / Alaska Native5,3710.9%
Native Hawaiian / Pacific Islander6790.1%
Two or More Races9330.2%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation.

Candidates