Irmo is a true toss-up. About 50% of voters here vote Democratic and 50% Republican.
About 83% of adults in Irmo typically vote, above the U.S. average of about 62%. Among adults in Irmo, ~41% vote Democratic, ~41% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Irmo compares
Among cities within 25 miles, Irmo sits roughly in the middle of the political spectrum, with 29 neighbors leaning further in the place's direction and 26 leaning the other way.
Irmo runs about 19 points more Democratic than South Carolina as a whole. South Carolina leans Republican overall, while Irmo sits closer to the political middle.
Politics vary noticeably by neighborhood within Irmo. The southeast side runs the most Democratic (D+26) and the north side runs the most Republican (R+18), a spread of about 45 points.
Why Irmo 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 Irmo, not a ranked or complete list of what matters most.
Irmo votes against the grain of South Carolina. South Carolina leans Republican overall, while Irmo runs about 19 points more Democratic.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Irmo, SC sits in the top quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Irmo looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Irmo 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 71%, about 11 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Ballentine, SC R+25
- Lake Murray of Richland, SC R+30
- White Rock, SC R+34
- Seven Oaks, SC D+12
- Richtex, SC D+16
- St. Andrews, SC D+59
- Chapin, SC R+40
- Peak, SC R+27
- Lexington, SC R+36
Cities with Similar Populations
- South Lyon, MI R+13
- Pleasant Grove, UT R+34
- West Monroe, LA R+52
- La Presa, CA D+18
- Hudsonville, MI R+32
- Oak Creek, WI R+3
- Arnold, MO R+31
- Battle Ground, WA R+21
- Elk Grove Village, IL D+3
- Natick, MA D+41
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.