Campbell County is a Republican stronghold. About 17% of voters here vote Democratic and 83% Republican.
About 57% of adults in Campbell County typically vote, near the U.S. average of about 62%. Among adults in Campbell County, ~10% vote Democratic, ~47% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How Campbell County compares
Among counties within 50 miles, Campbell County leans more Republican than 5 of 6 neighbors.
Campbell County runs about 37 points more Republican than South Dakota as a whole.
Why Campbell County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Campbell County. The lean here lands roughly where demographic data alone would predict.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Campbell County, SD sits in the bottom tenth nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Campbell County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Campbell County 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 70%, about 10 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Walworth County, SD R+56
- Emmons County, ND R+70
- McIntosh County, ND R+61
- Corson County, SD D+38
- Sioux County, ND D+54
- McPherson County, SD R+66
- Potter County, SD R+62
- Edmunds County, SD R+60
- Logan County, ND R+75
- Dewey County, SD D+30
Counties with Similar Populations
- Jackson County, CO R+42
- Cottle County, TX R+57
- Sterling County, TX R+80
- Carter County, MT R+78
- Issaquena County, MS R+11
- Edwards County, TX R+42
- Briscoe County, TX R+71
- Piute County, UT R+78
- Throckmorton County, TX R+76
- Harding County, SD R+88
Sources and methodology
Precinct-level voting records used to fit the model come from South Dakota Secretary of State, Elections, 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.