Delta County leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 82% of adults in Delta County typically vote, above the U.S. average of about 62%. Among adults in Delta County, ~26% vote Democratic, ~56% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Delta County compares
Among counties within 50 miles, Delta County is the most Republican-leaning.
Delta County runs about 46 points more Republican than Colorado as a whole. Colorado leans Democratic overall, while Delta County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Delta County. The south side is the most Republican-leaning (R+49) and the northeast side is the least Republican-leaning (R+9), a spread of about 40 points.
Why Delta County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Delta County, not a ranked or complete list of what matters most.
Delta County votes against the grain of Colorado. Colorado leans Democratic overall, while Delta County runs about 46 points more Republican.
Never-married share and voter turnout
Places with a low never-married share tend to turn out at a higher rate; Delta County, CO sits in the bottom quarter nationally on this measure.
Why turnout in Delta County looks the way it does
Turnout in Delta County sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Montrose County, CO R+30
- Mesa County, CO R+20
- Ouray County, CO D+13
- Garfield County, CO R+5
- Gunnison County, CO D+31
- San Miguel County, CO D+35
- Pitkin County, CO D+40
- Hinsdale County, CO R+6
- San Juan County, CO D+29
- Eagle County, CO D+14
Counties with Similar Populations
- Polk County, MN R+31
- Adams County, NE R+42
- Pontotoc County, MS R+65
- Titus County, TX R+40
- Clarendon County, SC R+8
- Lake County, MT R+21
- Coos County, NH R+24
- Washington County, ME R+24
- Amherst County, VA R+33
- Stone County, MO R+55
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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.