McMullen County is a Republican stronghold. About 20% of voters here vote Democratic and 80% Republican.
About 60% of adults in McMullen County typically vote, near the U.S. average of about 62%. Among adults in McMullen County, ~12% vote Democratic, ~48% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How McMullen County compares
Among counties within 50 miles, McMullen County leans more Republican than 6 of 7 neighbors.
McMullen County runs about 45 points more Republican than Texas as a whole.
Why McMullen 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 McMullen County, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 82% of households in McMullen County are family households, about 16 points above the U.S. average of 67%.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; McMullen County, TX sits in the bottom tenth nationally 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 McMullen County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. McMullen County 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 47%, about 7 points below the Texas average of 54%. Low high-school completion lines up with lower turnout, and about 86% of adults in McMullen County have completed high school, below 77% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Live Oak County, TX R+61
- Atascosa County, TX R+37
- La Salle County, TX R+13
- Frio County, TX R+13
- Bee County, TX R+22
- Duval County, TX R+10
- Karnes County, TX R+35
- Jim Wells County, TX R+14
- Wilson County, TX R+50
- Medina County, TX R+37
Counties with Similar Populations
- Loup County, NE R+72
- Grant County, NE R+84
- Borden County, TX R+93
- Harding County, NM R+37
- Yakutat City and Borough, AK Even
- Thomas County, NE R+76
- Banner County, NE R+79
- Petroleum County, MT R+69
- San Juan County, CO D+29
- Slope County, ND R+74
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.