Catonsville leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican.
About 77% of adults in Catonsville typically vote, above the U.S. average of about 62%. Among adults in Catonsville, ~52% vote Democratic, ~25% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How Catonsville compares
Among cities within 25 miles, Catonsville leans more Democratic than 84 of 154 neighbors.
Catonsville runs about 6 points more Democratic than Maryland as a whole.
Politics vary noticeably by neighborhood within Catonsville. The northeast side is the most Democratic-leaning (D+47) and the southwest side is the least Democratic-leaning (D+16), a spread of about 31 points.
Why Catonsville leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Catonsville, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 84% of residents in Catonsville live in densely developed areas, about 48 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Catonsville sits in the top quarter (about 54%, above 95% of cities). A high never-married share predicts Democratic voting, and about 39% of adults in Catonsville have never been married, above 93% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Catonsville, MD sits in the top tenth nationally on this measure.
Why turnout in Catonsville looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Catonsville 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%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Woodlawn, MD D+63
- Arbutus, MD D+11
- Halethorpe, MD D+12
- Gwynn Oak, MD D+84
- Lansdowne, MD D+13
- Linthicum Heights, MD D+17
- Ilchester, MD D+35
- Lochearn, MD D+81
- Baltimore Highlands, MD D+12
- Milford Mill, MD D+81
Cities with Similar Populations
- DeKalb, IL D+28
- Orange, TX R+44
- Monrovia, CA D+27
- East Stroudsburg, PA D+12
- Perrysburg, OH R+7
- Midlothian, TX R+42
- Levittown, NY R+21
- Romeoville, IL D+15
- Menlo Park, CA D+64
- Parkersburg, WV R+35
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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.