20602 is a Democratic stronghold. About 82% of voters here vote Democratic and 18% Republican.
About 71% of adults in 20602 typically vote, above the U.S. average of about 62%. Among adults in 20602, ~58% vote Democratic, ~13% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How 20602 compares
Among zip codes within 15 miles, 20602 leans more Democratic than 24 of 28 neighbors.
20602 runs about 34 points more Democratic than Maryland as a whole.
Politics vary noticeably by block within 20602. The south side is the most Democratic-leaning (D+82) and the southeast side is the least Democratic-leaning (D+43), a spread of about 38 points.
Why 20602 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 20602, not a ranked or complete list of what matters most.
Density combined with diversity predicts Democratic voting. Non-Hispanic white share in 20602 is about 19%, about 54 points below the U.S. average of 72%. A high never-married share predicts Democratic voting, and about 41% of adults in 20602 have never been married, above 88% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 20602, MD sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 20602 looks the way it does
Turnout in 20602 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.