Rock County leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 87% of adults in Rock County typically vote, above the U.S. average of about 62%. Among adults in Rock County, ~24% vote Democratic, ~64% Republican, and ~12% don't vote. The map below shows estimated turnout by block group.
How Rock County compares
Among counties within 50 miles, Rock County leans more Republican than 5 of 12 neighbors.
Rock County runs about 49 points more Republican than Minnesota as a whole. Minnesota leans Democratic overall, while Rock County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Rock County. The northwest side is the most Republican-leaning (R+64) and the east side is the least Republican-leaning (R+38), a spread of about 26 points.
Why Rock County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Rock County, not a ranked or complete list of what matters most.
Rock County votes against the grain of Minnesota. Minnesota leans Democratic overall, while Rock County runs about 49 points more Republican.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Rock County, MN 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 Rock County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Rock County 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 66%, about 6 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Lyon County, IA R+65
- Pipestone County, MN R+48
- Minnehaha County, SD R+10
- Nobles County, MN R+28
- Lincoln County, SD R+29
- Osceola County, IA R+57
- Moody County, SD R+40
- Murray County, MN R+54
- Sioux County, IA R+55
- O'Brien County, IA R+54
Counties with Similar Populations
- Wayne County, NE R+44
- Marion County, TX R+49
- Cumberland County, VA R+23
- Stevens County, MN R+37
- Switzerland County, IN R+63
- Zavala County, TX D+4
- Grand County, UT R+2
- Irwin County, GA R+43
- Clarke County, IA R+41
- West Carroll Parish, LA R+70
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Sources and methodology
Precinct-level voting records used to fit the model come from Minnesota 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.