21921 leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 73% of adults in 21921 typically vote, above the U.S. average of about 62%. Among adults in 21921, ~30% vote Democratic, ~43% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How 21921 compares
Among zip codes within 15 miles, 21921 leans more Republican than 19 of 30 neighbors.
21921 runs about 46 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21921 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 21921. The northeast side runs the most Democratic (D+3) and the northwest side runs the most Republican (R+42), a spread of about 44 points.
Why 21921 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 21921, not a ranked or complete list of what matters most.
21921 votes against the grain of Maryland. Maryland leans Democratic overall, while 21921 runs about 46 points more Republican.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 21921, MD sits above the national average on this measure.
Why turnout in 21921 looks the way it does
Turnout in 21921 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.