Longmont leans heavily Democratic by roughly 32 points: about 66% of voters vote Democratic and 34% Republican.
About 77% of adults in Longmont typically vote, above the U.S. average of about 62%. Among adults in Longmont, ~51% vote Democratic, ~26% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How Longmont compares
Among cities within 25 miles, Longmont leans more Democratic than 42 of 57 neighbors.
Longmont runs about 21 points more Democratic than Colorado as a whole.
Politics vary noticeably by neighborhood within Longmont. The south side is the most Democratic-leaning (D+44) and the southeast side is the least Democratic-leaning (D+18), a spread of about 26 points.
Why Longmont leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Longmont, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 82% of residents in Longmont live in densely developed areas, about 46 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Longmont sits in the top quarter (about 48%, above 93% of cities). A high never-married share predicts Democratic voting, and about 32% of adults in Longmont have never been married, above 79% of cities.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Longmont, CO sits in the top tenth nationally on this measure.
Why turnout in Longmont looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Longmont 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 68%, about 8 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Rinn, CO D+7
- Niwot, CO D+47
- Buda, CO R+13
- Mead, CO R+26
- Hygiene, CO D+29
- Gunbarrel, CO D+55
- Firestone, CO R+19
- Frederick, CO R+21
- Berthoud, CO R+14
- Erie, CO D+21
Cities with Similar Populations
- Downey, CA D+23
- Antioch, CA D+34
- Charlottesville, VA D+45
- Peoria, IL D+31
- High Point, NC D+22
- Santa Maria, CA D+10
- Bowling Green, KY R+11
- Sparks, NV Even
- Norcross, GA D+31
- Costa Mesa, CA D+8
All Local Stats
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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.