Williamson County leans Republican by roughly 28 points: about 36% of voters vote Democratic and 64% Republican.
About 82% of adults in Williamson County typically vote, above the U.S. average of about 62%. Among adults in Williamson County, ~29% vote Democratic, ~52% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How Williamson County compares
Among counties within 50 miles, Williamson County leans more Republican than 2 of 13 neighbors.
Politically, Williamson County sits close to the rest of Tennessee.
Politics vary noticeably by city within Williamson County. The southeast side is the most Republican-leaning (R+45) and the north side is the least Republican-leaning (R+23), a spread of about 22 points.
Why Williamson 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 Williamson County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 79% of households in Williamson County are family households, about 12 points above the U.S. average of 67%. Dense places usually vote Democratic, but Williamson County runs against that pattern.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; Williamson County, TN sits in the top tenth nationally on this measure.
Why turnout in Williamson County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Williamson 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 72%, about 12 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 81% of households in Williamson County own their home, above 84% of counties. High high-school completion lines up with higher turnout, and about 96% of adults in Williamson County have completed high school, above 97% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Davidson County, TN D+26
- Maury County, TN R+39
- Rutherford County, TN R+16
- Cheatham County, TN R+55
- Marshall County, TN R+54
- Dickson County, TN R+55
- Wilson County, TN R+39
- Hickman County, TN R+67
- Bedford County, TN R+51
- Sumner County, TN R+40
Counties with Similar Populations
- Chesapeake City, VA D+9
- Washington County, AR R+3
- Forsyth County, GA R+22
- Warren County, OH R+30
- Clay County, MO R+7
- Lafayette Parish, LA R+23
- Hays County, TX D+4
- Henry County, GA D+26
- Jefferson County, TX D+8
- Yakima County, WA R+6
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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.