51442 leans Republican by roughly 24 points: about 38% of voters vote Democratic and 62% Republican.
About 68% of adults in 51442 typically vote, above the U.S. average of about 62%. Among adults in 51442, ~26% vote Democratic, ~42% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How 51442 compares
Among zip codes within 15 miles, 51442 is the least Republican-leaning.
51442 runs about 11 points more Republican than Iowa as a whole.
Politics vary noticeably by block within 51442. The northwest side is the most Republican-leaning (R+49) and the west side is the least Republican-leaning (R+12), a spread of about 37 points.
Why 51442 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 51442. The lean here lands roughly where demographic data alone would predict.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 51442, IA sits in the top quarter nationally on this measure.
Why turnout in 51442 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 51442 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
Sources and methodology
Precinct-level voting records used to fit the model come from Iowa Secretary of State, Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.