Costilla leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% Republican.
About 41% of adults in Costilla typically vote, below the U.S. average of about 62%. Among adults in Costilla, ~26% vote Democratic, ~15% Republican, and ~59% don't vote. The map below shows estimated turnout by block group.
How Costilla compares
Among cities within 25 miles, Costilla leans more Democratic than 5 of 14 neighbors.
Costilla runs about 20 points more Democratic than New Mexico as a whole.
Politics vary noticeably by neighborhood within Costilla. The northeast side is the most Democratic-leaning (D+37) and the east side is the least Democratic-leaning (D+14), a spread of about 24 points.
Why Costilla leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Costilla. The lean here lands roughly where demographic data alone would predict.
Population density and Republican lean
Places with low population density tend to lean Republican; Costilla, NM sits in the bottom tenth nationally on this measure.
Why turnout in Costilla looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Costilla is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Crowded housing lines up with lower turnout, and about 5% of homes in Costilla have more than one occupant per room, above 86% of cities. High-crime urban areas turn out at lower rates, and Costilla sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Amalia, NM D+14
- Jaroso, CO D+33
- Cerro, NM D+34
- Los Fuertes, CO D+33
- San Luis, CO D+41
- San Pedro, CO D+33
- Viejo San Acacio, CO D+33
- Questa, NM D+24
- San Pablo, CO D+30
Cities with Similar Populations
- Wheatland, OR R+39
- Wales, AK D+33
- Lamasco, KY R+60
- Big Indian, NY D+35
- Harman, VA R+49
- Goober Hill, TX R+70
- Rek Hill, TX R+74
- Bennettsville, NY R+41
- Kimball, KS R+62
- Dukes, MI R+14
Sources and methodology
Precinct-level voting records used to fit the model come from New Mexico Secretary of State, Bureau of 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.