51545 leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 69% of adults in 51545 typically vote, above the U.S. average of about 62%. Among adults in 51545, ~19% vote Democratic, ~50% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How 51545 compares
Among zip codes within 15 miles, 51545 is the least Republican-leaning.
51545 runs about 31 points more Republican than Iowa as a whole.
Why 51545 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 51545, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 9% of adults in 51545 hold a bachelor's degree, about 15 points below the Iowa average of 24%.
Population density and Republican lean
Places with low population density tend to lean Republican; 51545, IA sits in the bottom quarter nationally on this measure.
Why turnout in 51545 looks the way it does
Turnout in 51545 sits close to the national pattern. 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.