Louisville is a Democratic stronghold. About 79% of voters here vote Democratic and 21% Republican.
About 94% of adults in Louisville typically vote, above the U.S. average of about 62%. Among adults in Louisville, ~74% vote Democratic, ~20% Republican, and ~6% don't vote. The map below shows estimated turnout by block group.
How Louisville compares
Among cities within 25 miles, Louisville leans more Democratic than 65 of 69 neighbors.
Louisville runs about 48 points more Democratic than Colorado as a whole.
Politics vary noticeably by neighborhood within Louisville. The west side is the most Democratic-leaning (D+62) and the southeast side is the least Democratic-leaning (D+43), a spread of about 19 points.
Why Louisville 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 Louisville, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 72% of adults in Louisville hold a bachelor's degree, about 44 points above the U.S. average of 28%. Dense areas vote Democratic, and Louisville sits in the top fifth on density (about 83%, above 95% of cities). A high never-married share predicts Democratic voting, and about 31% of adults in Louisville have never been married, above 78% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Louisville, CO sits in the top tenth nationally 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 Louisville looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Louisville 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 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in Louisville have completed high school, above 96% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Lafayette, CO D+49
- Superior, CO D+51
- Broomfield, CO D+22
- Erie, CO D+21
- Gunbarrel, CO D+55
- Boulder, CO D+69
- Eldorado Springs, CO D+53
- Niwot, CO D+47
- Westminster, CO D+19
- Federal Heights, CO D+18
Cities with Similar Populations
- Crofton, MD D+26
- Millington, TN R+18
- New Philadelphia, OH R+41
- Munster, IN D+6
- Hauppauge, NY R+20
- Holt, MI D+15
- North Kingstown, RI D+13
- Blackfoot, ID R+55
- Vincennes, IN R+32
- Saginaw, TX R+20
All Local Stats
Home Services
Sources and methodology
Precinct-level voting records used to fit the model come from Colorado Secretary of State, 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.