20623 is a Democratic stronghold. About 92% of voters here vote Democratic and 8% Republican.
About 86% of adults in 20623 typically vote, above the U.S. average of about 62%. Among adults in 20623, ~79% vote Democratic, ~7% Republican, and ~14% don't vote. The map below shows estimated turnout by block group.
How 20623 compares
Among zip codes within 15 miles, 20623 leans more Democratic than 44 of 53 neighbors.
20623 runs about 55 points more Democratic than Maryland as a whole.
Why 20623 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 20623, not a ranked or complete list of what matters most.
Density combined with diversity predicts Democratic voting. Non-Hispanic white share in 20623 is about 6%, about 66 points below the U.S. average of 72%. A high never-married share predicts Democratic voting, and about 34% of adults in 20623 have never been married, above 76% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 20623, MD sits in the top quarter nationally on this measure.
Why turnout in 20623 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20623 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 63%, above 55% of zip codes. Homeowners vote more often than renters, and about 96% of households in 20623 own their home, compared to around 68% 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.