Edison leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 60% of adults in Edison typically vote, near the U.S. average of about 62%. Among adults in Edison, ~34% vote Democratic, ~26% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How Edison compares
Among cities within 25 miles, Edison leans more Democratic than 134 of 222 neighbors.
Edison runs about 6 points more Democratic than New Jersey as a whole.
Politics vary noticeably by neighborhood within Edison. The west side runs the most Democratic (D+22) and the southwest side runs the most Republican (R+3), a spread of about 25 points.
Why Edison 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 Edison, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 93% of residents in Edison live in densely developed areas, about 57 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Edison sits in the top quarter (about 60%, above 97% of cities).
Population density and Democratic lean
Places with high population density tend to lean Democratic; Edison, NJ sits in the top tenth nationally on this measure.
Why turnout in Edison looks the way it does
Renters vote less often than owners. About 37% of households in Edison rent, about 12 points above the U.S. average of 25%. Strong routine healthcare access lines up with higher turnout, and Edison sits in the top quarter on routine-care measures. Crowded housing lines up with lower turnout, and about 7% of homes in Edison have more than one occupant per room, above 93% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Metuchen, NJ D+24
- Fords, NJ D+4
- South Plainfield, NJ D+2
- Iselin, NJ D+2
- Highland Park, NJ D+45
- Piscataway, NJ D+31
- Keasbey, NJ D+3
- Colonia, NJ R+9
- Woodbridge, NJ D+9
- New Brunswick, NJ D+40
Cities with Similar Populations
- North Charleston, SC D+37
- Lees Summit, MO Even
- West Covina, CA D+20
- San Marcos, CA D+11
- Davie, FL Even
- Gastonia, NC Even
- Rio Rancho, NM R+4
- North Hills, CA D+26
- Burbank, CA D+28
- Georgetown, TX R+15
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from New Jersey Division 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.