Monmouth Junction leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 68% of adults in Monmouth Junction typically vote, above the U.S. average of about 62%. Among adults in Monmouth Junction, ~41% vote Democratic, ~27% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How Monmouth Junction compares
Among cities within 25 miles, Monmouth Junction leans more Democratic than 168 of 203 neighbors.
Monmouth Junction runs about 17 points more Democratic than New Jersey as a whole.
Politics vary noticeably by neighborhood within Monmouth Junction. The west side is the most Democratic-leaning (D+36) and the north side is the least Democratic-leaning (D+7), a spread of about 29 points.
Why Monmouth Junction 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 Monmouth Junction, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 67% of adults in Monmouth Junction hold a bachelor's degree, about 38 points above the U.S. average of 28%. Dense areas vote Democratic, and Monmouth Junction sits in the top fifth on density (about 55%, above 88% of cities). A high never-married share predicts Democratic voting, and about 31% of adults in Monmouth Junction have never been married, above 77% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Monmouth Junction, NJ sits in the top quarter 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 Monmouth Junction looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Monmouth Junction 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 72%, about 12 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Heathcote, NJ D+32
- Dayton, NJ D+23
- Kendall Park, NJ D+17
- Franklin Park, NJ D+39
- Kingston, NJ D+15
- East Rocky Hill, NJ D+16
- Plainsboro, NJ D+34
- Griggstown, NJ D+25
- Princeton Meadows, NJ D+37
- Pleasant Plains, NJ D+22
Cities with Similar Populations
- Greencastle, PA R+46
- Cranberry Twp, PA R+12
- Berwick, PA R+35
- Summerfield, NC R+21
- Country Walk, FL R+19
- Hubert, NC R+42
- Elkhorn, WI R+22
- Fort Atkinson, WI R+16
- King, NC R+54
- Angola, IN R+40
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.