Johnston is a true toss-up. About 48% of voters here vote Democratic and 52% Republican.
About 59% of adults in Johnston typically vote, near the U.S. average of about 62%. Among adults in Johnston, ~28% vote Democratic, ~31% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How Johnston compares
Among cities within 25 miles, Johnston leans more Republican than 1 of 42 neighbors.
Johnston runs about 14 points more Democratic than South Carolina as a whole.
Politics vary noticeably by neighborhood within Johnston. The north side runs the most Democratic (D+12) and the southwest side runs the most Republican (R+34), a spread of about 47 points.
Why Johnston leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Johnston. The lean here lands roughly where demographic data alone would predict.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; Johnston, 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 Johnston looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Johnston is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 32% of households in Johnston rent, above 87% of cities. High food insecurity lines up with lower turnout, and about 33% of adults in Johnston report food insecurity, above 97% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Fruit Hill, SC R+2
- Ward, SC R+42
- Edgefield, SC R+6
- Ridge Spring, SC R+19
- Trenton, SC R+26
- Meeting Street, SC R+24
- Emory, SC R+19
- Pleasant Lane, SC R+18
- Monetta, SC R+30
Cities with Similar Populations
- Fremont, NH R+15
- Branchville, NJ R+32
- Nowata, OK R+54
- Jefferson, TX R+43
- Deale, MD R+9
- West Brookfield, MA R+6
- Altoona, AL R+83
- Wolf Point, MT D+6
- Bangor, MI R+19
- Henryville, IN R+53
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.