21223 is a Democratic stronghold. About 88% of voters here vote Democratic and 12% Republican.
About 46% of adults in 21223 typically vote, below the U.S. average of about 62%. Among adults in 21223, ~41% vote Democratic, ~5% Republican, and ~54% don't vote. The map below shows estimated turnout by block group.
How 21223 compares
Among zip codes within 15 miles, 21223 leans more Democratic than 59 of 69 neighbors.
21223 runs about 48 points more Democratic than Maryland as a whole.
Politics vary noticeably by block within 21223. The northwest side is the most Democratic-leaning (D+87) and the southwest side is the least Democratic-leaning (D+62), a spread of about 25 points.
Why 21223 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 21223, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 21223 live in densely developed areas, about 63 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 55% of adults in 21223 have never been married, above 97% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 21223, MD sits in the top tenth nationally on this measure.
Why turnout in 21223 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 21223 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 39%, about 25 points below the Maryland average of 64%. Renters vote less often than owners, and about 67% of households in 21223 rent, about 42 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 43% of adults in 21223 report food insecurity, in the top fraction 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.