80109 leans slightly Republican by roughly 12 points: about 44% of voters vote Democratic and 56% Republican.
About 91% of adults in 80109 typically vote, above the U.S. average of about 62%. Among adults in 80109, ~40% vote Democratic, ~51% Republican, and ~9% don't vote. The map below shows estimated turnout by block group.
How 80109 compares
Among zip codes within 15 miles, 80109 leans more Republican than 8 of 15 neighbors.
80109 runs about 24 points more Republican than Colorado as a whole. Colorado leans Democratic overall, while 80109 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 80109. The southwest side is the most Republican-leaning (R+21) and the northeast side is the least Republican-leaning (R+4), a spread of about 17 points.
Why 80109 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 80109, not a ranked or complete list of what matters most.
80109 votes Republican even though it is densely developed (about 69%, far above the Colorado average of 35%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 78% of households in 80109 are family households, above 88% of zip codes. 80109 runs against the grain of Colorado, a Republican-leaning pocket in a Democratic-leaning state.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; 80109, CO sits in the top tenth nationally on this measure.
Why turnout in 80109 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 80109 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 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in 80109 have completed high school, above 96% 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.