20748 is a Democratic stronghold. About 92% of voters here vote Democratic and 8% Republican.
About 62% of adults in 20748 typically vote, near the U.S. average of about 62%. Among adults in 20748, ~57% vote Democratic, ~5% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How 20748 compares
Among zip codes within 15 miles, 20748 leans more Democratic than 102 of 107 neighbors.
20748 runs about 56 points more Democratic than Maryland as a whole.
Why 20748 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 20748, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 90% of residents in 20748 live in densely developed areas, about 54 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 48% of adults in 20748 have never been married, above 94% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 20748, MD sits in the top tenth nationally on this measure.
Why turnout in 20748 looks the way it does
Renters vote less often than owners. About 40% of households in 20748 rent, about 15 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 26% of adults in 20748 report food insecurity, above 90% 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.