20615 leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 76% of adults in 20615 typically vote, above the U.S. average of about 62%. Among adults in 20615, ~28% vote Democratic, ~48% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How 20615 compares
Among zip codes within 15 miles, 20615 leans more Republican than 16 of 22 neighbors.
20615 runs about 54 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 20615 is one of the few Republican-leaning pockets.
Why 20615 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 20615, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 88% of residents in 20615 drive to work alone, about 14 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 77% of households in 20615 are family households, above 87% of zip codes. 20615 runs against the grain of Maryland, a Republican-leaning pocket in a Democratic-leaning state.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 20615, MD sits in the top quarter 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 20615 looks the way it does
Homeowners vote more often than renters. About 95% of households in 20615 own their home, about 18 points above the Maryland average of 77%. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
Sources and methodology
Precinct-level voting records used to fit the model come from Maryland State Board 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.