50313 leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 58% of adults in 50313 typically vote, near the U.S. average of about 62%. Among adults in 50313, ~32% vote Democratic, ~26% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.
How 50313 compares
Among zip codes within 15 miles, 50313 leans more Democratic than 22 of 34 neighbors.
50313 runs about 24 points more Democratic than Iowa as a whole. Iowa leans Republican overall, while 50313 is one of the few Democratic-leaning pockets.
Politics vary noticeably by block within 50313. The southwest side runs the most Democratic (D+27) and the northwest side runs the most Republican (R+20), a spread of about 47 points.
Why 50313 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 50313, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 87% of residents in 50313 live in densely developed areas, about 51 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 40% of adults in 50313 have never been married, above 88% of zip codes. 50313 runs against the grain of Iowa, a Democratic-leaning pocket in a Republican-leaning state.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 50313, IA sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 50313 looks the way it does
Crowded housing lines up with lower turnout. About 4% of homes in 50313 have more than one occupant per room, above 82% 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.