Williamson County is a true toss-up. About 50% of voters here vote Democratic and 50% Republican.
About 68% of adults in Williamson County typically vote, above the U.S. average of about 62%. Among adults in Williamson County, ~34% vote Democratic, ~34% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How Williamson County compares
Among counties within 50 miles, Williamson County sits roughly in the middle of the political spectrum, with 10 neighbors leaning further in the place's direction and 2 leaning the other way.
Williamson County runs about 14 points more Democratic than Texas as a whole. Texas leans Republican overall, while Williamson County sits closer to the political middle.
Politics vary noticeably by city within Williamson County. The south side runs the most Democratic (D+16) and the northwest side runs the most Republican (R+31), a spread of about 47 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.
Williamson County votes against the grain of Texas. Texas leans Republican overall, while Williamson County runs about 14 points more Democratic.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Williamson County, TX sits in the top tenth nationally on this measure.
Why turnout in Williamson County looks the way it does
Areas with high high-school completion turn out at higher rates. About 94% of adults in Williamson County have completed high school, about 9 points above the Texas average of 86%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Travis County, TX D+37
- Burnet County, TX R+56
- Bastrop County, TX R+24
- Bell County, TX R+3
- Hays County, TX D+4
- Lampasas County, TX R+55
- Milam County, TX R+51
- Coryell County, TX R+27
- Llano County, TX R+56
- Caldwell County, TX R+17
Counties with Similar Populations
- Johnson County, KS D+9
- Brevard County, FL R+19
- Washington County, OR D+32
- Montgomery County, TX R+35
- Anne Arundel County, MD D+17
- Baltimore City, MD D+72
- Douglas County, NE D+17
- Jefferson County, CO D+18
- Ocean County, NJ R+39
- Bristol County, MA Even
All Local Stats
Home Services
Sources and methodology
Precinct-level voting records used to fit the model come from Texas Secretary of State, Elections Division, 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.