21628 leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 98% of adults in 21628 typically vote, above the U.S. average of about 62%. Among adults in 21628, ~30% vote Democratic, ~68% Republican, and ~2% don't vote. The map below shows estimated turnout by block group.
How 21628 compares
Among zip codes within 15 miles, 21628 leans more Republican than 12 of 23 neighbors.
21628 runs about 67 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21628 is one of the few Republican-leaning pockets.
Why 21628 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 21628, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 90% of residents in 21628 drive to work alone, about 16 points above the U.S. average of 74%. 21628 runs against the grain of Maryland, a Republican-leaning pocket in a Democratic-leaning state.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; 21628, MD sits in the bottom tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 21628 looks the way it does
Homeowners vote more often than renters. About 93% of households in 21628 own their home, about 16 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.