21227 leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 62% of adults in 21227 typically vote, near the U.S. average of about 62%. Among adults in 21227, ~35% vote Democratic, ~27% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How 21227 compares
Among zip codes within 15 miles, 21227 leans more Democratic than 10 of 71 neighbors.
21227 runs about 18 points more Republican than Maryland as a whole.
Politics vary noticeably by block within 21227. The east side runs the most Democratic (D+22) and the south side runs the most Republican (R+8), a spread of about 30 points.
Why 21227 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 21227, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 95% of residents in 21227 live in densely developed areas, about 59 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 39% of adults in 21227 have never been married, above 86% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 21227, MD sits in the top tenth nationally on this measure.
Why turnout in 21227 looks the way it does
Renters vote less often than owners. About 36% of households in 21227 rent, about 11 points above the U.S. average of 25%. 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.