21030 leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% Republican.
About 67% of adults in 21030 typically vote, near the U.S. average of about 62%. Among adults in 21030, ~42% vote Democratic, ~25% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How 21030 compares
Among zip codes within 15 miles, 21030 leans more Democratic than 25 of 57 neighbors.
Politically, 21030 sits close to the rest of Maryland.
Politics vary noticeably by block within 21030. The southeast side is the most Democratic-leaning (D+42) and the southwest side is the least Democratic-leaning (Even), a spread of about 41 points.
Why 21030 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 21030, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 73% of residents in 21030 live in densely developed areas, about 37 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 21030 sits in the top quarter (about 55%, above 92% of zip codes). A high never-married share predicts Democratic voting, and about 39% of adults in 21030 have never been married, above 87% of zip codes.
Park access and Democratic lean
Places with heavy park coverage tend to lean Democratic; 21030, MD sits in the top quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in 21030 looks the way it does
Turnout in 21030 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.