Sullivan County is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 72% of adults in Sullivan County typically vote, above the U.S. average of about 62%. Among adults in Sullivan County, ~16% vote Democratic, ~56% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How Sullivan County compares
Among counties within 50 miles, Sullivan County leans more Republican than 4 of 11 neighbors.
Sullivan County runs about 37 points more Republican than Missouri as a whole.
Why Sullivan County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Sullivan 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; Sullivan County, MO 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 Sullivan County looks the way it does
Turnout in Sullivan County sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Putnam County, MO R+68
- Grundy County, MO R+57
- Adair County, MO R+21
- Mercer County, MO R+70
- Linn County, MO R+55
- Schuyler County, MO R+67
- Wayne County, IA R+56
- Livingston County, MO R+52
- Appanoose County, IA R+43
- Macon County, MO R+57
Counties with Similar Populations
- Miller County, GA R+44
- Greenwood County, KS R+61
- Benson County, ND D+2
- Ohio County, IN R+58
- Sherman County, KS R+66
- Grant County, MN R+36
- Crowley County, CO R+47
- Essex County, VT R+31
- Reynolds County, MO R+67
- Pondera County, MT R+35
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Missouri 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.