52166 leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 81% of adults in 52166 typically vote, above the U.S. average of about 62%. Among adults in 52166, ~22% vote Democratic, ~59% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How 52166 compares
Among zip codes within 15 miles, 52166 leans more Republican than 11 of 12 neighbors.
52166 runs about 32 points more Republican than Iowa as a whole.
Why 52166 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 52166, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 76% of households in 52166 are family households, about 9 points above the U.S. average of 67%.
Population density and Republican lean
Places with low population density tend to lean Republican; 52166, IA sits in the bottom quarter nationally on this measure.
Why turnout in 52166 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 52166 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 68%, about 8 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 88% of households in 52166 own their home, above 82% of zip codes. High high-school completion lines up with higher turnout, and about 97% of adults in 52166 have completed high school, above 90% of zip codes. 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.