21766 is a Republican stronghold. About 17% of voters here vote Democratic and 83% Republican.
About 60% of adults in 21766 typically vote, near the U.S. average of about 62%. Among adults in 21766, ~10% vote Democratic, ~50% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How 21766 compares
Among zip codes within 15 miles, 21766 leans more Republican than 3 of 8 neighbors.
21766 runs about 95 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21766 is one of the few Republican-leaning pockets.
Why 21766 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 21766, not a ranked or complete list of what matters most.
21766 votes against the grain of Maryland. Maryland leans Democratic overall, while 21766 runs about 95 points more Republican.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 21766, MD sits in the bottom 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 21766 looks the way it does
Crowded housing lines up with lower turnout. About 17% of homes in 21766 have more than one occupant per room, in the top fraction of zip codes. Low high-school completion lines up with lower turnout, and about 95% of adults in 21766 have completed high school, above 76% 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.