21163 leans heavily Democratic by roughly 32 points: about 66% of voters vote Democratic and 34% Republican.
About 84% of adults in 21163 typically vote, above the U.S. average of about 62%. Among adults in 21163, ~55% vote Democratic, ~29% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 21163 compares
Among zip codes within 15 miles, 21163 leans more Democratic than 21 of 57 neighbors.
21163 runs about 4 points more Democratic than Maryland as a whole.
Politics vary noticeably by block within 21163. The northeast side is the most Democratic-leaning (D+71) and the north side is the least Democratic-leaning (D+17), a spread of about 54 points.
Why 21163 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 21163, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 63% of adults in 21163 hold a bachelor's degree, about 34 points above the U.S. average of 28%.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 21163, MD sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 21163 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 21163 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 71%, about 11 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in 21163 have completed high school, above 94% 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.