21212 is a Democratic stronghold. About 83% of voters here vote Democratic and 17% Republican.
About 75% of adults in 21212 typically vote, above the U.S. average of about 62%. Among adults in 21212, ~62% vote Democratic, ~13% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How 21212 compares
Among zip codes within 15 miles, 21212 leans more Democratic than 49 of 67 neighbors.
21212 runs about 38 points more Democratic than Maryland as a whole.
Politics vary noticeably by block within 21212. The southeast side is the most Democratic-leaning (D+85) and the northwest side is the least Democratic-leaning (D+46), a spread of about 40 points.
Why 21212 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 21212, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 58% of adults in 21212 hold a bachelor's degree, about 30 points above the U.S. average of 28%. Dense areas vote Democratic, and 21212 sits in the top fifth on density (about 99%, above 95% of zip codes). A high never-married share predicts Democratic voting, and about 36% of adults in 21212 have never been married, above 80% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 21212, MD sits in the top tenth nationally on this measure.
Why turnout in 21212 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 21212 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 66%, about 6 points above the U.S. average of 60%. 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.