51030 leans heavily Republican by roughly 50 points: about 25% of voters vote Democratic and 75% Republican.
About 87% of adults in 51030 typically vote, above the U.S. average of about 62%. Among adults in 51030, ~22% vote Democratic, ~65% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How 51030 compares
Among zip codes within 15 miles, 51030 leans more Republican than 12 of 16 neighbors.
51030 runs about 36 points more Republican than Iowa as a whole.
Why 51030 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 51030, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 85% of residents in 51030 drive to work alone, about 11 points above the U.S. average of 74%.
Population density and Republican lean
Places with low population density tend to lean Republican; 51030, IA sits below the national average on this measure.
Why turnout in 51030 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 51030 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 70%, about 10 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in 51030 have completed high school, above 93% 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.