Union leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 64% of adults in Union typically vote, near the U.S. average of about 62%. Among adults in Union, ~26% vote Democratic, ~38% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How Union compares
Among cities within 25 miles, Union leans more Republican than 9 of 57 neighbors.
Politically, Union sits close to the rest of South Carolina.
Politics vary noticeably by neighborhood within Union. The west side runs the most Democratic (D+12) and the northwest side runs the most Republican (R+47), a spread of about 59 points.
Why Union 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 Union, not a ranked or complete list of what matters most.
Union votes Republican even though it is densely developed (about 41%, well above the South Carolina average of 24%). State and regional patterns outweigh the Democratic lean that density usually predicts here. Low college attainment predicts Republican voting, and Union sits in the bottom quarter (about 14%, below 82% of cities).
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; Union, SC sits in the bottom 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 Union looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Union 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 Cities
- Monarch, SC R+18
- South Hills, SC R+28
- Buffalo, SC R+60
- Adamsburg, SC R+47
- Kelly, SC R+37
- Jonesville, SC R+46
- Robat, SC R+61
- Kelton, SC R+57
- Lockhart Junction, SC R+53
- West Springs, SC R+64
Cities with Similar Populations
- Connellsville, PA R+38
- Cypress Lake, FL R+19
- Midlothian, IL D+11
- Millersburg, OH R+69
- McFarland, CA D+9
- Hawaiian Paradise Park, HI D+13
- Cambridge, MN R+27
- Corydon, IN R+46
- Cloquet, MN R+4
- Dunkirk, NY Even
All Local Stats
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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.