75604 leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 61% of adults in 75604 typically vote, near the U.S. average of about 62%. Among adults in 75604, ~21% vote Democratic, ~40% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How 75604 compares
Among zip codes within 15 miles, 75604 leans more Republican than 3 of 10 neighbors.
75604 runs about 18 points more Republican than Texas as a whole.
Politics vary noticeably by block within 75604. The southwest side is the most Republican-leaning (R+54) and the southeast side is the least Republican-leaning (R+12), a spread of about 42 points.
Why 75604 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 75604, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 84% of residents in 75604 drive to work alone, about 10 points above the U.S. average of 74%.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; 75604, TX sits in the bottom quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 75604 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 75604 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 35% of households in 75604 rent, above 82% of zip codes. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.