Seneca County leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 69% of adults in Seneca County typically vote, above the U.S. average of about 62%. Among adults in Seneca County, ~28% vote Democratic, ~41% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How Seneca County compares
Among counties within 50 miles, Seneca County leans more Republican than 7 of 13 neighbors.
Seneca County runs about 31 points more Republican than New York as a whole. New York leans Democratic overall, while Seneca County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Seneca County. The northwest side is the most Republican-leaning (R+34) and the south side is the least Republican-leaning (R+6), a spread of about 28 points.
Why Seneca 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 Seneca County, not a ranked or complete list of what matters most.
Seneca County votes against the grain of New York. New York leans Democratic overall, while Seneca County runs about 31 points more Republican.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Seneca County, NY sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Seneca County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Seneca County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Cayuga County, NY R+17
- Yates County, NY R+28
- Ontario County, NY R+2
- Wayne County, NY R+23
- Schuyler County, NY R+23
- Tompkins County, NY D+49
- Onondaga County, NY D+21
- Cortland County, NY R+17
- Monroe County, NY D+25
- Steuben County, NY R+32
Counties with Similar Populations
- Pulaski County, VA R+43
- Wakulla County, FL R+46
- Marshall County, MS R+3
- Wexford County, MI R+33
- DeSoto County, FL R+35
- Stark County, ND R+53
- Morrison County, MN R+53
- Fulton County, IL R+31
- Halifax County, VA R+19
- Harvey County, KS R+33
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Sources and methodology
Precinct-level voting records used to fit the model come from New York State Board 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.