Grundy Center leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 82% of adults in Grundy Center typically vote, above the U.S. average of about 62%. Among adults in Grundy Center, ~23% vote Democratic, ~59% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Grundy Center compares
Among cities within 25 miles, Grundy Center leans more Republican than 30 of 47 neighbors.
Grundy Center runs about 30 points more Republican than Iowa as a whole.
Why Grundy Center leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Grundy Center. 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; Grundy Center, IA sits in the top tenth 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 Grundy Center looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Grundy Center 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 73%, about 13 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Morrison, IA R+38
- Holland, IA R+52
- Lincoln, IA R+47
- Sinclair, IA R+54
- Beaman, IA R+42
- Wellsburg, IA R+50
- Reinbeck, IA R+37
- Conrad, IA R+42
- Dike, IA R+35
- Zaneta, IA R+34
Cities with Similar Populations
- Buffalo, TX R+65
- Sutton, WV R+54
- Heiskell, TN R+62
- Columbia City, OR R+22
- San Manuel, AZ R+26
- Catawissa, MO R+51
- Orangeville, PA R+46
- Clayton, NY R+12
- Harwich, MA D+23
- Black Hawk, CO D+15
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.