50020 leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 80% of adults in 50020 typically vote, above the U.S. average of about 62%. Among adults in 50020, ~22% vote Democratic, ~58% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.
How 50020 compares
Among zip codes within 15 miles, 50020 leans more Republican than 2 of 10 neighbors.
50020 runs about 33 points more Republican than Iowa as a whole.
Why 50020 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 50020, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In 50020, about 95% of residents are non-Hispanic white, about 23 points above the U.S. average of 72%; about 17% of adults hold a bachelor's degree, about 8 points below the Iowa average of 24%. Car-dependent areas vote Republican, and about 83% of residents in 50020 drive to work alone, above 81% of zip codes.
High-school completion, developed land, and voter turnout
Places that combine high-school-completion-heavy adults and a rural land-use pattern tend to turn out at a higher rate, as 50020, IA does.
Why turnout in 50020 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 50020 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 65%, about 5 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 88% of households in 50020 own their home, above 80% 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.