80305 is a Democratic stronghold. About 88% of voters here vote Democratic and 12% Republican.
About 90% of adults in 80305 typically vote, above the U.S. average of about 62%. Among adults in 80305, ~79% vote Democratic, ~11% Republican, and ~10% don't vote. The map below shows estimated turnout by block group.
How 80305 compares
Among zip codes within 15 miles, 80305 is the most Democratic-leaning.
80305 runs about 65 points more Democratic than Colorado as a whole.
Why 80305 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 80305, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 79% of adults in 80305 hold a bachelor's degree, about 51 points above the U.S. average of 28%. Dense areas vote Democratic, and 80305 sits in the top fifth on density (about 83%, above 84% of zip codes). A high never-married share predicts Democratic voting, and about 44% of adults in 80305 have never been married, above 91% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 80305, CO sits in the top quarter nationally on this measure.
Why turnout in 80305 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 80305 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 73%, about 13 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and more than 99% of adults in 80305 have completed high school, above 98% 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 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.