Sullivan City leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican.
About 37% of adults in Sullivan City typically vote, below the U.S. average of about 62%. Among adults in Sullivan City, ~17% vote Democratic, ~20% Republican, and ~63% don't vote. The map below shows estimated turnout by block group.
How Sullivan City compares
Among cities within 25 miles, Sullivan City leans more Republican than 13 of 30 neighbors.
Sullivan City runs about 7 points more Democratic than Texas as a whole.
Politics vary noticeably by neighborhood within Sullivan City. The north side is the most Republican-leaning (R+20) and the west side is the least Republican-leaning (R+3), a spread of about 17 points.
Why Sullivan City leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Sullivan City, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 11% of adults in Sullivan City hold a bachelor's degree, about 15 points below the Texas average of 26%. Dense places usually vote Democratic, but Sullivan City runs against that pattern. A high family-household share predicts Republican voting, and about 86% of households in Sullivan City are family households, above 97% of cities.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; Sullivan City, TX sits in the bottom tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Sullivan City looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Sullivan City is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 37%, about 17 points below the Texas average of 54%. Low high-school completion lines up with lower turnout, and about 56% of adults in Sullivan City have completed high school, in the bottom fraction of cities. High-crime urban areas turn out at lower rates, and Sullivan City sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- East Alto Bonito, TX R+14
- Grulla, TX R+14
- La Joya, TX R+2
- La Grulla, TX R+6
- Penitas, TX R+7
- Abram, TX R+6
- La Casita, TX R+9
- Garciasville, TX R+8
- Palmview, TX R+3
Cities with Similar Populations
- Flora, IL R+56
- Hawley, PA R+31
- Denver City, TX R+57
- Eureka, IL R+38
- Lone Grove, OK R+65
- Bloomingburg, NY R+36
- Elberta, AL R+75
- Hillsville, VA R+63
- Aynor, SC R+62
- Monson, MA R+16
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.