21810 leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 91% of adults in 21810 typically vote, above the U.S. average of about 62%. Among adults in 21810, ~41% vote Democratic, ~50% Republican, and ~9% don't vote. The map below shows estimated turnout by block group.
How 21810 compares
Among zip codes within 15 miles, 21810 leans more Republican than 7 of 18 neighbors.
21810 runs about 40 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21810 is one of the few Republican-leaning pockets.
Why 21810 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 21810, not a ranked or complete list of what matters most.
21810 votes against the grain of Maryland. Maryland leans Democratic overall, while 21810 runs about 40 points more Republican.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; 21810, MD sits in the bottom quarter 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 21810 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 21810 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 63%, above 56% of zip codes. Homeowners vote more often than renters, and about 95% of households in 21810 own their home, compared to around 75% in nearby zip codes. High high-school completion lines up with higher turnout, and about 96% of adults in 21810 have completed high school, above 84% 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.