Sumner County leans heavily Republican by roughly 40 points: about 30% of voters vote Democratic and 70% Republican.
About 72% of adults in Sumner County typically vote, above the U.S. average of about 62%. Among adults in Sumner County, ~22% vote Democratic, ~50% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How Sumner County compares
Among counties within 50 miles, Sumner County leans more Republican than 6 of 19 neighbors.
Sumner County runs about 10 points more Republican than Tennessee as a whole.
Politics vary noticeably by city within Sumner County. The northeast side is the most Republican-leaning (R+66) and the east side is the least Republican-leaning (R+27), a spread of about 39 points.
Why Sumner County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Sumner County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 72% of households in Sumner County are family households, about 5 points above the U.S. average of 67%. Dense places usually vote Democratic, but Sumner County runs against that pattern.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Sumner County, TN sits above the national average 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 Sumner County looks the way it does
Turnout in Sumner 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
- Wilson County, TN R+39
- Robertson County, TN R+46
- Trousdale County, TN R+59
- Davidson County, TN D+26
- Simpson County, KY R+42
- Macon County, TN R+68
- Allen County, KY R+64
- Cheatham County, TN R+55
- Smith County, TN R+64
- Rutherford County, TN R+16
Counties with Similar Populations
- Sangamon County, IL Even
- Minnehaha County, SD R+10
- Racine County, WI D+7
- Hernando County, FL R+33
- Deschutes County, OR D+5
- Broome County, NY D+3
- Livingston County, MI R+23
- Butler County, PA R+28
- Ellis County, TX R+31
- St. Louis County, MN D+12
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Sources and methodology
Precinct-level voting records used to fit the model come from Tennessee Secretary of State, Division of 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.