21102 leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 90% of adults in 21102 typically vote, above the U.S. average of about 62%. Among adults in 21102, ~29% vote Democratic, ~61% Republican, and ~10% don't vote. The map below shows estimated turnout by block group.
How 21102 compares
Among zip codes within 15 miles, 21102 leans more Republican than 15 of 20 neighbors.
21102 runs about 65 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21102 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 21102. The north side is the most Republican-leaning (R+42) and the southwest side is the least Republican-leaning (R+29), a spread of about 12 points.
Why 21102 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 21102, not a ranked or complete list of what matters most.
21102 votes against the grain of Maryland. Maryland leans Democratic overall, while 21102 runs about 65 points more Republican. A high family-household share predicts Republican voting, and about 81% of households in 21102 are family households, above 93% of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 21102, 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 21102 looks the way it does
Homeowners vote more often than renters. About 90% of households in 21102 own their home, about 13 points above the Maryland average of 77%. High high-school completion lines up with higher turnout, and about 98% of adults in 21102 have completed high school, above 94% of zip codes. 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.