Onondaga leans Democratic by roughly 16 points: about 58% of voters vote Democratic and 42% Republican.
About 62% of adults in Onondaga typically vote, near the U.S. average of about 62%. Among adults in Onondaga, ~36% vote Democratic, ~26% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How Onondaga compares
Among cities within 25 miles, Onondaga leans more Democratic than 114 of 118 neighbors.
Politically, Onondaga sits close to the rest of New York.
Why Onondaga 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 Onondaga, not a ranked or complete list of what matters most.
Areas with many never-married adults vote Democratic. About 45% of adults in Onondaga have never been married, well above similar-sized cities (around 23%).
Population density and Democratic lean
Places with high population density tend to lean Democratic; Onondaga, NY sits above the national average on this measure.
Why turnout in Onondaga looks the way it does
Strong routine healthcare access lines up with higher turnout, and Onondaga sits in the top quarter on routine-care measures. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Nedrow, NY D+6
- Sentinel Heights, NY R+4
- Cardiff, NY R+11
- Lafayette, NY R+10
- Jamesville, NY D+22
- South Onondaga, NY R+16
- Pompey, NY R+16
- Syracuse, NY D+10
Cities with Similar Populations
- Johnson, NE R+54
- Alpine, AZ R+55
- Victory Heights, PA R+54
- Mico, TX R+58
- Springdale, UT R+54
- Northwye, MO R+60
- Severy, KS R+69
- Summerset, IA R+36
- Southfields, NY R+3
- Taylor, ND R+74
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.