20646 is a true toss-up. About 52% of voters here vote Democratic and 48% Republican.
About 78% of adults in 20646 typically vote, above the U.S. average of about 62%. Among adults in 20646, ~41% vote Democratic, ~37% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How 20646 compares
Among zip codes within 15 miles, 20646 leans more Democratic than 10 of 22 neighbors.
20646 runs about 25 points more Republican than Maryland as a whole.
Politics vary noticeably by block within 20646. The northeast side runs the most Democratic (D+30) and the southeast side runs the most Republican (R+25), a spread of about 55 points.
Why 20646 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 20646. The lean here lands roughly where demographic data alone would predict.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 20646, MD sits above the national average on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 20646 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 20646 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 66%, about 6 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 88% of households in 20646 own their home, above 81% 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.