New Castle leans heavily Democratic by roughly 48 points: about 74% of voters vote Democratic and 26% Republican.
About 62% of adults in New Castle typically vote, near the U.S. average of about 62%. Among adults in New Castle, ~46% vote Democratic, ~16% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How New Castle compares
Among cities within 25 miles, New Castle leans more Democratic than 151 of 155 neighbors.
New Castle runs about 34 points more Democratic than Delaware as a whole.
Politics vary noticeably by neighborhood within New Castle. The northeast side is the most Democratic-leaning (D+57) and the northwest side is the least Democratic-leaning (D+5), a spread of about 51 points.
Why New Castle 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 New Castle, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 80% of residents in New Castle live in densely developed areas, about 44 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 40% of adults in New Castle have never been married, above 94% of cities.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; New Castle, DE sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in New Castle looks the way it does
Renters vote less often than owners. About 33% of households in New Castle rent, about 8 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 20% of adults in New Castle report food insecurity, above 81% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Wilmington Manor, DE D+31
- Newport, DE D+22
- Pennsville, NJ R+27
- Elsmere, DE D+28
- Deepwater, NJ R+22
- Brookside, DE D+24
- Mahoneyville, NJ R+24
- Newark, DE D+34
- Delaware City, DE R+4
- Bear, DE D+32
Cities with Similar Populations
- Dunwoody, GA D+30
- Cathedral City, CA D+22
- Sevierville, TN R+58
- Princeton, NJ D+53
- Lombard, IL D+14
- Middleburg, FL R+46
- Spring Valley, NY Even
- Palm Desert, CA D+5
- Kendale Lakes, FL R+39
- Bluffton, SC R+16
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Delaware Department 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.