80303 is a Democratic stronghold. About 84% of voters here vote Democratic and 16% Republican.
About 76% of adults in 80303 typically vote, above the U.S. average of about 62%. Among adults in 80303, ~64% vote Democratic, ~12% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How 80303 compares
Among zip codes within 15 miles, 80303 leans more Democratic than 24 of 27 neighbors.
80303 runs about 57 points more Democratic than Colorado as a whole.
Politics vary noticeably by block within 80303. The north side is the most Democratic-leaning (D+73) and the east side is the least Democratic-leaning (D+54), a spread of about 19 points.
Why 80303 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 80303, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 80% of adults in 80303 hold a bachelor's degree, about 51 points above the U.S. average of 28%. Dense areas vote Democratic, and 80303 sits in the top fifth on density (about 83%, above 84% of zip codes). A high never-married share predicts Democratic voting, and about 52% of adults in 80303 have never been married, above 96% of zip codes.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 80303, CO sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 80303 looks the way it does
Areas with high high-school completion turn out at higher rates. About 98% of adults in 80303 have completed high school, about 6 points above the Colorado average of 93%. 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.