50440 leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 84% of adults in 50440 typically vote, above the U.S. average of about 62%. Among adults in 50440, ~27% vote Democratic, ~57% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 50440 compares
Among zip codes within 15 miles, 50440 leans more Republican than 4 of 12 neighbors.
50440 runs about 22 points more Republican than Iowa as a whole.
Why 50440 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 50440, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In 50440, about 97% of residents are non-Hispanic white, about 25 points above the U.S. average of 72%; about 14% of adults hold a bachelor's degree, about 10 points below the Iowa average of 24%. Rural areas vote Republican, and 50440 sits in the bottom quarter on density (about 6%, below 76% of zip codes).
Population density and Republican lean
Places with low population density tend to lean Republican; 50440, IA sits in the bottom quarter nationally on this measure.
Why turnout in 50440 looks the way it does
Turnout in 50440 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.