Galveston County leans slightly Republican by roughly 14 points: about 43% of voters vote Democratic and 57% Republican.
About 66% of adults in Galveston County typically vote, near the U.S. average of about 62%. Among adults in Galveston County, ~28% vote Democratic, ~38% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.
How Galveston County compares
Among counties within 50 miles, Galveston County leans more Republican than 2 of 4 neighbors.
Politically, Galveston County sits close to the rest of Texas.
Politics vary noticeably by city within Galveston County. The southeast side runs the most Democratic (D+16) and the southwest side runs the most Republican (R+59), a spread of about 75 points.
Why Galveston 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 Galveston County, not a ranked or complete list of what matters most.
Galveston County votes Republican even though it is densely developed (about 81%, far above the Texas average of 35%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 70% of households in Galveston County are family households, above 77% of counties.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Galveston County, TX sits in the top tenth nationally on this measure.
Why turnout in Galveston County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Galveston County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Brazoria County, TX R+17
- Chambers County, TX R+58
- Harris County, TX D+13
- Fort Bend County, TX D+6
- Liberty County, TX R+50
- Montgomery County, TX R+35
- Waller County, TX R+20
- Matagorda County, TX R+32
- Jefferson County, TX D+8
- Wharton County, TX R+33
Counties with Similar Populations
- Horry County, SC R+30
- Nueces County, TX R+4
- Hamilton County, IN R+5
- Westmoreland County, PA R+26
- Marion County, OR D+3
- Somerset County, NJ D+15
- Douglas County, CO R+7
- Larimer County, CO D+16
- Rutherford County, TN R+16
- Davis County, UT R+24
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.