21875 leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 69% of adults in 21875 typically vote, above the U.S. average of about 62%. Among adults in 21875, ~32% vote Democratic, ~37% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How 21875 compares
Among zip codes within 15 miles, 21875 leans more Republican than 4 of 18 neighbors.
21875 runs about 37 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21875 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 21875. The north side runs the most Democratic (D+11) and the northeast side runs the most Republican (R+20), a spread of about 31 points.
Why 21875 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 21875, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 84% of residents in 21875 drive to work alone, about 10 points above the U.S. average of 74%. 21875 runs against the grain of Maryland, a Republican-leaning pocket in a Democratic-leaning state.
Park access and Republican lean
Places with low park coverage tend to lean Republican; 21875, MD sits in the bottom quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in 21875 looks the way it does
Turnout in 21875 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.