Baltimore County leans Democratic by roughly 28 points: about 64% of voters vote Democratic and 36% Republican.
About 71% of adults in Baltimore County typically vote, above the U.S. average of about 62%. Among adults in Baltimore County, ~45% vote Democratic, ~26% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How Baltimore County compares
Among counties within 50 miles, Baltimore County leans more Democratic than 9 of 18 neighbors.
Politically, Baltimore County sits close to the rest of Maryland.
Politics vary noticeably by city within Baltimore County. The west side runs the most Democratic (D+72) and the northeast side runs the most Republican (R+2), a spread of about 74 points.
Why Baltimore County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Baltimore County, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 81% of residents in Baltimore County live in densely developed areas, about 44 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Baltimore County sits in the top quarter (about 42%, above 93% of counties). A high never-married share predicts Democratic voting, and about 37% of adults in Baltimore County have never been married, above 88% of counties.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Baltimore County, MD sits in the top tenth nationally on this measure.
Why turnout in Baltimore County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Baltimore County 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 62%, above 63% of counties. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Baltimore City, MD D+72
- Howard County, MD D+40
- Harford County, MD R+4
- Anne Arundel County, MD D+17
- Carroll County, MD R+24
- Kent County, MD Even
- Montgomery County, MD D+52
- Queen Anne's County, MD R+27
- Prince George's County, MD D+71
- District of Columbia, DC D+80
Counties with Similar Populations
- Montgomery County, PA D+21
- Worcester County, MA D+12
- Middlesex County, NJ D+11
- Essex County, NJ D+48
- Ventura County, CA D+16
- El Paso County, TX D+15
- Hidalgo County, TX R+2
- San Francisco County, CA D+61
- Hamilton County, OH D+21
- Snohomish County, WA D+10
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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.