Cumberland County leans slightly Democratic by roughly 8 points: about 54% of voters vote Democratic and 46% Republican.
About 58% of adults in Cumberland County typically vote, near the U.S. average of about 62%. Among adults in Cumberland County, ~31% vote Democratic, ~27% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.
How Cumberland County compares
Among counties within 50 miles, Cumberland County leans more Democratic than 6 of 12 neighbors.
Politically, Cumberland County sits close to the rest of New Jersey.
Politics vary noticeably by city within Cumberland County. The west side runs the most Democratic (D+32) and the south side runs the most Republican (R+21), a spread of about 53 points.
Why Cumberland County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Cumberland County, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 62% of residents in Cumberland County live in densely developed areas, about 25 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 40% of adults in Cumberland County have never been married, above 93% of counties.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Cumberland County, 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 Cumberland County looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Cumberland County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 34% of households in Cumberland County rent, above 84% of counties. High food insecurity lines up with lower turnout, and about 26% of adults in Cumberland County report food insecurity, above 90% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Salem County, NJ R+12
- Gloucester County, NJ R+2
- Atlantic County, NJ D+4
- Cape May County, NJ R+18
- Camden County, NJ D+30
- Kent County, DE D+5
- New Castle County, DE D+33
- Delaware County, PA D+27
- Philadelphia County, PA D+56
- Burlington County, NJ D+16
Counties with Similar Populations
- Berrien County, MI Even
- Canadian County, OK R+37
- Citrus County, FL R+43
- Merrimack County, NH D+6
- Washington County, MD R+18
- Monroe County, MI R+27
- Santa Fe County, NM D+45
- Johnson County, IA D+36
- Mesa County, CO R+20
- Kings County, CA R+10
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.