20720 is a Democratic stronghold. About 86% of voters here vote Democratic and 14% Republican.
About 87% of adults in 20720 typically vote, above the U.S. average of about 62%. Among adults in 20720, ~75% vote Democratic, ~12% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How 20720 compares
Among zip codes within 15 miles, 20720 leans more Democratic than 57 of 88 neighbors.
20720 runs about 43 points more Democratic than Maryland as a whole.
Politics vary noticeably by block within 20720. The southwest side is the most Democratic-leaning (D+81) and the east side is the least Democratic-leaning (D+65), a spread of about 15 points.
Why 20720 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 20720, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 58% of adults in 20720 hold a bachelor's degree, about 30 points above the U.S. average of 28%. Dense areas vote Democratic, and 20720 sits in the top fifth on density (about 75%, above 81% of zip codes).
Population density and Democratic lean
Places with high population density tend to lean Democratic; 20720, MD sits in the top quarter nationally on this measure.
Why turnout in 20720 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20720 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 67%, about 7 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 92% of households in 20720 own their home, compared to around 76% in nearby 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.