Seneca leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 88% of adults in Seneca typically vote, above the U.S. average of about 62%. Among adults in Seneca, ~23% vote Democratic, ~65% Republican, and ~12% don't vote. The map below shows estimated turnout by block group.
How Seneca compares
Among cities within 25 miles, Seneca leans more Republican than 13 of 111 neighbors.
Seneca runs about 46 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by neighborhood within Seneca. The southeast side is the most Republican-leaning (R+55) and the northeast side is the least Republican-leaning (R+45), a spread of about 11 points.
Why Seneca leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Seneca. The lean here lands roughly where demographic data alone would predict.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Seneca, PA sits above the national average on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Seneca looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in Seneca have completed high school, about 7 points above the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Woodland Heights, PA R+42
- Hill City, PA R+53
- Oil City, PA R+33
- Victory Heights, PA R+54
- Van, PA R+54
- Cranberry, PA R+55
- Enterprise, PA R+55
- Rouseville, PA R+52
- Franklin, PA R+26
Cities with Similar Populations
- Sparrow Bush, NY R+33
- Haysi, VA R+67
- North Beach Haven, NJ R+15
- Lynch Station, VA R+50
- Robards, KY R+54
- Caney, KS R+65
- Flovilla, GA R+37
- Tillson, NY D+22
- Oakville, CA D+31
- Welches, OR Even
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Pennsylvania Department of State, Bureau of 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.