81635 leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 74% of adults in 81635 typically vote, above the U.S. average of about 62%. Among adults in 81635, ~23% vote Democratic, ~51% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How 81635 compares
81635 sits in a sparsely populated area with few comparable zip codes nearby.
81635 runs about 49 points more Republican than Colorado as a whole. Colorado leans Democratic overall, while 81635 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 81635. The west side is the most Republican-leaning (R+58) and the south side is the least Republican-leaning (R+30), a spread of about 28 points.
Why 81635 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 81635, not a ranked or complete list of what matters most.
81635 votes against the grain of Colorado. Colorado leans Democratic overall, while 81635 runs about 49 points more Republican.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; 81635, CO sits in the bottom quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 81635 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 81635 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. 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.