21920 leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 92% of adults in 21920 typically vote, above the U.S. average of about 62%. Among adults in 21920, ~29% vote Democratic, ~63% Republican, and ~8% don't vote. The map below shows estimated turnout by block group.
How 21920 compares
Among zip codes within 15 miles, 21920 leans more Republican than 27 of 32 neighbors.
21920 runs about 64 points more Republican than Maryland as a whole. Maryland leans Democratic overall, while 21920 is one of the few Republican-leaning pockets.
Why 21920 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 21920, not a ranked or complete list of what matters most.
21920 votes against the grain of Maryland. Maryland leans Democratic overall, while 21920 runs about 64 points more Republican. Car-dependent areas vote Republican, and about 85% of residents in 21920 drive to work alone, above 87% of zip codes. A high family-household share predicts Republican voting, and about 77% of households in 21920 are family households, above 84% of zip codes.
Renting and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; 21920, MD sits in the bottom quarter nationally on this measure.
Why turnout in 21920 looks the way it does
Homeowners vote more often than renters. About 90% of households in 21920 own their home, about 13 points above the Maryland average of 77%. 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.