21918 is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 81% of adults in 21918 typically vote, above the U.S. average of about 62%. Among adults in 21918, ~19% vote Democratic, ~62% Republican, and ~19% don't vote. The map below shows estimated turnout by block group.
How 21918 compares
Among zip codes within 15 miles, 21918 leans more Republican than 24 of 28 neighbors.
21918 runs about 82 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21918 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 21918. The west side is the most Republican-leaning (R+56) and the south side is the least Republican-leaning (R+46), a spread of about 10 points.
Why 21918 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 21918, not a ranked or complete list of what matters most.
21918 votes against the grain of Maryland. Maryland leans Democratic overall, while 21918 runs about 82 points more Republican.
Renting and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; 21918, MD sits in the bottom quarter nationally on this measure.
Why turnout in 21918 looks the way it does
Turnout in 21918 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.