Colleton County leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 68% of adults in Colleton County typically vote, above the U.S. average of about 62%. Among adults in Colleton County, ~28% vote Democratic, ~40% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How Colleton County compares
Among counties within 50 miles, Colleton County is the most Republican-leaning.
Politically, Colleton County sits close to the rest of South Carolina.
Politics vary noticeably by city within Colleton County. The south side runs the most Democratic (D+28) and the east side runs the most Republican (R+45), a spread of about 73 points.
Why Colleton 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 Colleton County, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 17% of adults in Colleton County hold a bachelor's degree, about 6 points below the South Carolina average of 23%.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Colleton County, 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 Colleton County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Colleton County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Dorchester County, SC R+12
- Hampton County, SC D+9
- Bamberg County, SC D+18
- Berkeley County, SC R+13
- Allendale County, SC D+37
- Charleston County, SC D+14
- Orangeburg County, SC D+28
- Jasper County, SC Even
- Beaufort County, SC R+9
- Barnwell County, SC R+13
Counties with Similar Populations
- Isle of Wight County, VA R+17
- Warren County, PA R+41
- Graham County, AZ R+39
- Gloucester County, VA R+38
- Champaign County, OH R+51
- Finney County, KS R+25
- Woodford County, IL R+40
- Dallas County, AL D+38
- Guernsey County, OH R+50
- Susquehanna County, PA R+45
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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.