Harleyville leans Republican by roughly 16 points: about 42% of voters vote Democratic and 58% Republican.
About 68% of adults in Harleyville typically vote, above the U.S. average of about 62%. Among adults in Harleyville, ~29% vote Democratic, ~40% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How Harleyville compares
Among cities within 25 miles, Harleyville leans more Republican than 20 of 39 neighbors.
Politically, Harleyville sits close to the rest of South Carolina.
Politics vary noticeably by neighborhood within Harleyville. The southeast side is the most split-leaning (R+21) and the west side is the least split-leaning (R+3), a spread of about 18 points.
Why Harleyville 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 Harleyville, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 89% of residents in Harleyville drive to work alone, about 15 points above the U.S. average of 74%. Low college attainment predicts Republican voting, and Harleyville sits in the bottom quarter (about 13%, below 83% of cities).
Park access and Republican lean
Places with low park coverage tend to lean Republican; Harleyville, SC sits in the bottom quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Harleyville looks the way it does
Turnout in Harleyville 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
- Rosinville, SC R+13
- Dorchester, SC R+30
- Four Holes, SC R+11
- Pregnall, SC R+31
- St. George, SC Even
- Holly Hill, SC D+33
- Grover, SC R+15
- Reevesville, SC R+8
- Ridgeville, SC R+20
- Jedburg, SC R+20
Cities with Similar Populations
- Bear Lake, MI R+21
- Inyokern, CA R+40
- Dedeaux, MS R+82
- Depoy, KY R+60
- Doerun, GA R+57
- Lynn, IN R+60
- Mauriceville, TX R+81
- Waitsfield, VT D+29
- Selmont-West Selmont, AL D+78
- South Wales, NY R+31
Sources and methodology
Precinct-level voting records used to fit the model come from South Carolina State Election Commission, 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.