Petrolia is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 62% of adults in Petrolia typically vote, near the U.S. average of about 62%. Among adults in Petrolia, ~14% vote Democratic, ~48% Republican, and ~38% 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 7 of 38 neighbors.
Petrolia runs about 40 points more Republican than Kansas as a whole.
Politics vary noticeably by neighborhood within Petrolia. The west side is the most Republican-leaning (R+61) and the northeast side is the least Republican-leaning (R+46), a spread of about 15 points.
Why Petrolia leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Petrolia. The lean here lands roughly where demographic data alone would predict.
Non-English at home and voter turnout
Places with a high non-English-at-home share tend to turn out at a lower rate; Petrolia, KS sits in the top quarter nationally on this measure.
Why turnout in Petrolia looks the way it does
Crowded housing lines up with lower turnout. About 4% of homes in Petrolia have more than one occupant per room, above 85% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Chanute, KS R+40
- Humboldt, KS R+47
- Vilas, KS R+64
- Shaw, KS R+61
- Earlton, KS R+61
- Savonburg, KS R+59
- Piqua, KS R+60
- Buffalo, KS R+68
- Iola, KS R+42
Cities with Similar Populations
- Glenview, KY R+5
- Ouzinkie, AK R+12
- Raysal, WV R+75
- Cameron, NY R+62
- King Ferry, NY R+20
- Vidette, GA Even
- Cochrane, WI R+32
- La Fayette, IL R+43
- Union, WV R+59
- Frederika, IA R+45
Sources and methodology
Precinct-level voting records used to fit the model come from Kansas Secretary of State, Elections, 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.