Rocky Hill, NJ Political Map | Democrat & Republican Areas in Rocky Hill

By the BestNeighborhood data science team. Last updated May 2026.

Rocky Hill leans heavily Democratic by roughly 40 points: about 70% of voters vote Democratic and 30% Republican.

 

About 90% of adults in Rocky Hill typically vote, above the U.S. average of about 62%. Among adults in Rocky Hill, ~63% vote Democratic, ~27% Republican, and ~10% don't vote. The map below shows estimated turnout by block group.

How Rocky Hill compares

Among cities within 25 miles, Rocky Hill leans more Democratic than 195 of 202 neighbors.

Rocky Hill runs about 35 points more Democratic than New Jersey as a whole.

Why Rocky Hill 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 Rocky Hill, not a ranked or complete list of what matters most.

Areas with high college attainment vote Democratic. About 71% of adults in Rocky Hill hold a bachelor's degree, about 43 points above the U.S. average of 28%. Dense areas vote Democratic, and Rocky Hill sits in the top fifth on density (about 56%, above 89% of cities).

Preventive-care access and voter turnout

Places with strong routine preventive-care access tend to turn out at a higher rate; Rocky Hill, NJ sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.

Why turnout in Rocky Hill looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Rocky Hill 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 76%, about 16 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in Rocky Hill have completed high school, above 93% of cities. Learn more about the findings and methodology on the political spectrum map.

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.