Plainsboro leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican.
About 74% of adults in Plainsboro typically vote, above the U.S. average of about 62%. Among adults in Plainsboro, ~50% vote Democratic, ~24% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Plainsboro compares
Among cities within 25 miles, Plainsboro leans more Democratic than 180 of 196 neighbors.
Plainsboro runs about 28 points more Democratic than New Jersey as a whole.
Why Plainsboro 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 Plainsboro, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 84% of adults in Plainsboro hold a bachelor's degree, about 56 points above the U.S. average of 28%. Dense areas vote Democratic, and Plainsboro sits in the top fifth on density (about 55%, above 88% of cities).
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Plainsboro, NJ sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Plainsboro looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Plainsboro 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 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Plainsboro have completed high school, above 90% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Princeton Meadows, NJ D+37
- Kingston, NJ D+15
- Penns Neck, NJ D+37
- Princeton, NJ D+53
- Cranbury, NJ D+23
- Heathcote, NJ D+32
- Princeton Junction, NJ D+42
- Monmouth Junction, NJ D+23
- Dayton, NJ D+23
- Rocky Hill, NJ D+41
Cities with Similar Populations
- Calverton, MD D+62
- Magnolia, MS D+12
- Alvaton, KY R+43
- Somerville, TN R+16
- Falfurrias, TX D+7
- East Farmingdale, NY Even
- Tarawa Terrace, NC R+21
- Potomac Mills, VA D+22
- Hadley, MA D+52
- Kountze, TX R+69
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.