21229 is a Democratic stronghold. About 87% of voters here vote Democratic and 13% Republican.
About 57% of adults in 21229 typically vote, near the U.S. average of about 62%. Among adults in 21229, ~50% vote Democratic, ~7% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How 21229 compares
Among zip codes within 15 miles, 21229 leans more Democratic than 59 of 72 neighbors.
21229 runs about 45 points more Democratic than Maryland as a whole.
Politics vary noticeably by block within 21229. The north side is the most Democratic-leaning (D+88) and the southeast side is the least Democratic-leaning (D+39), a spread of about 50 points.
Why 21229 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 21229, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 95% of residents in 21229 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 53% of adults in 21229 have never been married, above 96% of zip codes.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 21229, MD sits in the top 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 21229 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 21229 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 43% of households in 21229 rent, about 18 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 28% of adults in 21229 report food insecurity, above 92% 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.