Rock Hill leans heavily Democratic by roughly 48 points: about 74% of voters vote Democratic and 26% Republican.
About 75% of adults in Rock Hill typically vote, above the U.S. average of about 62%. Among adults in Rock Hill, ~55% vote Democratic, ~20% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How Rock Hill compares
Among cities within 25 miles, Rock Hill leans more Democratic than 127 of 177 neighbors.
Rock Hill runs about 65 points more Democratic than Missouri as a whole. Missouri leans Republican overall, while Rock Hill is one of the few Democratic-leaning pockets.
Politics vary noticeably by neighborhood within Rock Hill. The southeast side is the most Democratic-leaning (D+64) and the southwest side is the least Democratic-leaning (D+34), a spread of about 30 points.
Why Rock Hill 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 Rock Hill, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Rock Hill live in densely developed areas, about 64 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Rock Hill sits in the top quarter (about 62%, above 97% of cities). Rock Hill runs against the grain of Missouri, a Democratic-leaning pocket in a Republican-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Rock Hill, MO sits in the top tenth nationally on this measure.
Why turnout in Rock Hill looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Rock Hill 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 69%, about 9 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Rock Hill have completed high school, above 87% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Brentwood, MO D+31
- Warson Woods, MO Even
- Glendale, MO D+30
- Webster Groves, MO D+38
- Huntleigh, MO R+23
- Ladue, MO D+7
- Maplewood, MO D+57
- Shrewsbury, MO D+32
- Richmond Heights, MO D+50
- Frontenac, MO Even
Cities with Similar Populations
- Stillwater, NY R+18
- New Plymouth, ID R+65
- Avalon, PA D+31
- New Holstein, WI R+42
- Welsh, LA R+58
- Greenwood Lake, NY R+13
- Carey, OH R+50
- Mineral Bluff, GA R+66
- Chauvin, LA R+75
- Hendron, KY R+35
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Sources and methodology
Precinct-level voting records used to fit the model come from Missouri 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.