50641 leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 68% of adults in 50641 typically vote, above the U.S. average of about 62%. Among adults in 50641, ~19% vote Democratic, ~49% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How 50641 compares
Among zip codes within 15 miles, 50641 leans more Republican than 11 of 12 neighbors.
50641 runs about 31 points more Republican than Iowa as a whole.
Why 50641 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 50641, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In 50641, about 93% of residents are non-Hispanic white, about 21 points above the U.S. average of 72%; about 19% of adults hold a bachelor's degree, about 9 points below the U.S. average of 28%. A high family-household share predicts Republican voting, and about 74% of households in 50641 are family households, above 77% of zip codes.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; 50641, IA sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 50641 looks the way it does
Homeowners vote more often than renters. About 88% of households in 50641 own their home, about 7 points above the Iowa average of 81%. 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.