Old Brazoria is a Republican stronghold. About 20% of voters here vote Democratic and 80% Republican.
About 66% of adults in Old Brazoria typically vote, near the U.S. average of about 62%. Among adults in Old Brazoria, ~13% vote Democratic, ~53% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.
How Old Brazoria compares
Among cities within 25 miles, Old Brazoria leans more Republican than 30 of 35 neighbors.
Old Brazoria runs about 46 points more Republican than Texas as a whole.
Politics vary noticeably by neighborhood within Old Brazoria. The northeast side is the most Republican-leaning (R+68) and the west side is the least Republican-leaning (R+58), a spread of about 11 points.
Why Old Brazoria 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 Old Brazoria, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 87% of residents in Old Brazoria drive to work alone, about 14 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 77% of households in Old Brazoria are family households, above 83% of cities.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; Old Brazoria, TX sits below the national average on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Old Brazoria looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Old Brazoria 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 Cities
- Brazoria, TX R+51
- Jones Creek, TX R+56
- Wild Peach Village, TX R+57
- Cedar Lake, TX R+59
- Perry Landing, TX R+39
- Sweeny, TX R+52
- Cedar Lane, TX R+50
- West Columbia, TX R+49
- Lake Jackson, TX R+36
Cities with Similar Populations
- Jeffersonville, IL R+73
- Myra, TX R+80
- Walnut Hill, LA R+85
- Melvin, IA R+65
- Mossy Head, FL R+70
- Union, TX R+76
- Chestnut Mound, TN R+66
- Pike, OR R+30
- Pinnebog, MI R+46
- Littles Corners, PA R+48
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.