21655 leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 77% of adults in 21655 typically vote, above the U.S. average of about 62%. Among adults in 21655, ~22% vote Democratic, ~56% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How 21655 compares
Among zip codes within 15 miles, 21655 leans more Republican than 12 of 15 neighbors.
21655 runs about 74 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21655 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 21655. The southwest side is the most Republican-leaning (R+48) and the east side is the least Republican-leaning (R+36), a spread of about 12 points.
Why 21655 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 21655, not a ranked or complete list of what matters most.
21655 votes against the grain of Maryland. Maryland leans Democratic overall, while 21655 runs about 74 points more Republican. Car-dependent areas vote Republican, and about 86% of residents in 21655 drive to work alone, above 89% of zip codes.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; 21655, MD sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 21655 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 21655 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 64%, above 62% 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.