Onawa leans heavily Republican by roughly 40 points: about 30% of voters vote Democratic and 70% Republican.
About 98% of adults in Onawa typically vote, above the U.S. average of about 62%. Among adults in Onawa, ~29% vote Democratic, ~69% Republican, and ~2% don't vote. The map below shows estimated turnout by block group.
How Onawa compares
Among cities within 25 miles, Onawa leans more Republican than 3 of 32 neighbors.
Onawa runs about 28 points more Republican than Iowa as a whole.
Politics vary noticeably by neighborhood within Onawa. The northwest side is the most Republican-leaning (R+50) and the east side is the least Republican-leaning (R+39), a spread of about 11 points.
Why Onawa leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Onawa, not a ranked or complete list of what matters most.
Onawa votes Republican even though it is densely developed (about 32%, well above the Iowa average of 16%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Onawa, IA sits above the national average 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 Onawa looks the way it does
Turnout in Onawa sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Blencoe, IA R+50
- Turin, IA R+48
- Whiting, IA R+48
- Decatur, NE R+61
- Castana, IA R+49
- Ticonic, IA R+47
- Rodney, IA R+49
- Moorhead, IA R+48
- Macy, NE D+72
Cities with Similar Populations
- Cornwall On Hudson, NY D+7
- Edgewood, PA D+69
- Oak Ridge North, TX R+37
- Borrego Springs, CA R+13
- Kingsbury, TX R+52
- Winfield, PA R+42
- Fontana-on-Geneva Lake, WI R+2
- Collinsville, TX R+66
- Lone Oak, TX R+73
- Wedgefield, SC D+14
All Local Stats
Home Services
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.