Spring Grove leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 82% of adults in Spring Grove typically vote, above the U.S. average of about 62%. Among adults in Spring Grove, ~28% vote Democratic, ~54% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Spring Grove compares
Among cities within 25 miles, Spring Grove leans more Republican than 8 of 61 neighbors.
Spring Grove runs about 20 points more Republican than Iowa as a whole.
Politics vary noticeably by neighborhood within Spring Grove. The southwest side is the most Republican-leaning (R+40) and the east side is the least Republican-leaning (R+27), a spread of about 12 points.
Why Spring Grove 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 Spring Grove, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 90% of residents in Spring Grove drive to work alone, about 17 points above the U.S. average of 74%.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Spring Grove, IA sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Spring Grove looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Spring Grove 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%. Homeowners vote more often than renters, and about 96% of households in Spring Grove own their home, about 21 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 96% of adults in Spring Grove have completed high school, above 86% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Burlington, IA Even
- Wever, IA R+35
- Shokokon, IL R+32
- West Burlington, IA R+15
- Carman, IL R+38
- Lomax, IL R+48
- Middletown, IA R+40
- Denmark, IA R+36
- Dallas City, IL R+48
Cities with Similar Populations
- Whitcomb, IN R+66
- East Gilead, MI R+50
- Knowlton, WI R+38
- Loxa, IL R+45
- Osceola, LA R+65
- Old Town, OR R+38
- Mazama, WA D+51
- Driggs, AR R+69
- St. Paul, IA R+46
- Felderville, SC R+12
All Local Stats
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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.