50648 leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 98% of adults in 50648 typically vote, above the U.S. average of about 62%. Among adults in 50648, ~31% vote Democratic, ~66% Republican, and ~3% don't vote. The map below shows estimated turnout by block group.
How 50648 compares
Among zip codes within 15 miles, 50648 leans more Republican than 7 of 15 neighbors.
50648 runs about 24 points more Republican than Iowa as a whole.
Politics vary noticeably by block within 50648. The northwest side is the most Republican-leaning (R+46) and the northeast side is the least Republican-leaning (R+34), a spread of about 12 points.
Why 50648 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 50648. The lean here lands roughly where demographic data alone would predict.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 50648, IA sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 50648 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 50648 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 69%, about 9 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in 50648 have completed high school, above 83% 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.