Sewell leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 87% of adults in Sewell typically vote, above the U.S. average of about 62%. Among adults in Sewell, ~40% vote Democratic, ~47% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How Sewell compares
Among cities within 25 miles, Sewell leans more Republican than 153 of 222 neighbors.
Sewell runs about 14 points more Republican than New Jersey as a whole. New Jersey leans Democratic overall, while Sewell is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Sewell. The southwest side is the most Republican-leaning (R+28) and the north side is the least Republican-leaning (R+3), a spread of about 25 points.
Why Sewell 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 Sewell, not a ranked or complete list of what matters most.
Sewell votes Republican even though it is densely developed (about 74%, modestly above the New Jersey average of 61%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 78% of households in Sewell are family households, above 84% of cities. Sewell runs against the grain of New Jersey, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Sewell, NJ sits in the top tenth nationally on this measure.
Why turnout in Sewell looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Sewell 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 71%, about 11 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Sewell have completed high school, above 81% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Pitman, NJ Even
- Grenloch, NJ R+9
- Blackwood, NJ D+2
- Glassboro, NJ D+20
- Richwood, NJ R+8
- Wenonah, NJ D+2
- Mantua, NJ R+6
- Woodbury Heights, NJ R+3
- Sicklerville, NJ D+34
- Woodbury, NJ D+9
Cities with Similar Populations
- East Meadow, NY R+9
- Salem, VA R+25
- Flowery Branch, GA R+40
- Channelview, TX R+3
- Cottage Grove, MN D+7
- Carlsbad, NM R+43
- Fernandina Beach, FL R+33
- Russellville, AR R+35
- Carpentersville, IL D+17
- La Quinta, CA Even
All Local Stats
Home Services
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.