Petrolia is a Republican stronghold. About 11% of voters here vote Democratic and 89% Republican.
About 78% of adults in Petrolia typically vote, above the U.S. average of about 62%. Among adults in Petrolia, ~9% vote Democratic, ~69% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How Petrolia compares
Among cities within 25 miles, Petrolia leans more Republican than 24 of 26 neighbors.
Petrolia runs about 65 points more Republican than Texas as a whole.
Why Petrolia 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 Petrolia, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 5% of residents in Petrolia live in densely developed areas, about 30 points below the Texas average of 35%. Low college attainment predicts Republican voting, and Petrolia sits in the bottom quarter (about 11%, below 91% of cities).
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; Petrolia, TX sits in the bottom tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Petrolia looks the way it does
Turnout in Petrolia sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Byers, TX R+78
- Dean, TX R+78
- Taylor, OK R+70
- Jolly, TX R+77
- Henrietta, TX R+66
- Bluegrove, TX R+77
- Cashion Community, TX R+70
- Ryan, OK R+67
Cities with Similar Populations
- Hayes, WI R+30
- Muttonville, MI R+48
- Buckskin, IN R+58
- Greystone, TN R+73
- Twin Oaks, OK R+59
- Macksville, KS R+73
- Union, NE R+45
- Deer Lake, PA R+45
- Nobleton, FL R+51
- Harrington, WA R+60
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.