21733 leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 65% of adults in 21733 typically vote, near the U.S. average of about 62%. Among adults in 21733, ~20% vote Democratic, ~45% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How 21733 compares
Among zip codes within 15 miles, 21733 leans more Republican than 19 of 24 neighbors.
21733 runs about 67 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21733 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 21733. The southeast side is the most Republican-leaning (R+50) and the northeast side is the least Republican-leaning (R+25), a spread of about 24 points.
Why 21733 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 21733, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 87% of residents in 21733 drive to work alone, about 13 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 86% of households in 21733 are family households, above 98% of zip codes. 21733 runs against the grain of Maryland, a Republican-leaning pocket in a Democratic-leaning state.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 21733, MD sits above the national average 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 21733 looks the way it does
Turnout in 21733 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.