Brazoria County leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 63% of adults in Brazoria County typically vote, near the U.S. average of about 62%. Among adults in Brazoria County, ~26% vote Democratic, ~37% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How Brazoria County compares
Among counties within 50 miles, Brazoria County leans more Republican than 3 of 6 neighbors.
Politically, Brazoria County sits close to the rest of Texas.
Politics vary noticeably by city within Brazoria County. The northwest side runs the most Democratic (D+30) and the southeast side runs the most Republican (R+56), a spread of about 85 points.
Why Brazoria 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 Brazoria County, not a ranked or complete list of what matters most.
Brazoria County votes Republican even though it is densely developed (about 67%, 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 75% of households in Brazoria County are family households, above 95% of counties.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Brazoria County, TX sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Brazoria County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Brazoria 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
- Galveston County, TX R+13
- Fort Bend County, TX D+6
- Harris County, TX D+13
- Matagorda County, TX R+32
- Wharton County, TX R+33
- Chambers County, TX R+58
- Waller County, TX R+20
- Montgomery County, TX R+35
- Austin County, TX R+54
- Liberty County, TX R+50
Counties with Similar Populations
- Washtenaw County, MI D+44
- Bell County, TX R+3
- Lehigh County, PA D+6
- Stark County, OH R+18
- Collier County, FL R+20
- Marion County, FL R+28
- Hamilton County, TN R+10
- Chesterfield County, VA D+12
- Anoka County, MN Even
- 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.