81129 leans slightly Republican by roughly 12 points: about 44% of voters vote Democratic and 56% Republican.
About 55% of adults in 81129 typically vote, below the U.S. average of about 62%. Among adults in 81129, ~24% vote Democratic, ~31% Republican, and ~45% don't vote. The map below shows estimated turnout by block group.
How 81129 compares
Among zip codes within 15 miles, 81129 is the least Republican-leaning.
81129 runs about 23 points more Republican than Colorado as a whole. Colorado leans Democratic overall, while 81129 is one of the few Republican-leaning pockets.
Why 81129 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 81129, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 13% of adults in 81129 hold a bachelor's degree, about 25 points below the Colorado average of 39%. 81129 runs against the grain of Colorado, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Republican lean
Places with low population density tend to lean Republican; 81129, CO sits in the bottom quarter nationally on this measure.
Why turnout in 81129 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 81129 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The uninsured rate here is about 22%, about 11 points above the Colorado average of 11%. Renters vote less often than owners, and about 34% of households in 81129 rent, above 80% of zip codes. High-crime urban areas turn out at lower rates, and 81129 sits in the top 15% on a violent-crime measure. 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.