3,686 people (2024 Census estimate, +5.3% since 2020)
1,228 square miles of land · 3 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
8 active community water systems list Costilla County in the area they serve, reporting 2,355 people served in all (a system that crosses county lines counts its whole population).
| SAN LUIS WSD groundwater · local government · CO0112900 | 629 served |
| COSTILLA COUNTY WS groundwater · local government · CO0112300 | 561 served |
| FT GARLAND WSD groundwater · local government · CO0112500 | 477 served |
| BLANCA TOWN OF groundwater · local government · CO0112100 | 469 served |
| GARCIA DOMESTIC WUA groundwater · private · CO0112700 | 100 served |
| VIEJO SAN ACACIO groundwater · local government · CO0112810 | 45 served |
| SAN ACACIO DOMESTIC WA groundwater · private · CO0112850 | 40 served |
| LAKE SANCHEZ ESTATES groundwater · private · CO0212466 | 34 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 0 people were held in Costilla County's jail, in Vera's latest figure (2025). In 2020 it was about 12.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
2 school districts have their office in Costilla County. School taxes are usually the largest part of a property tax bill.
Spent $12.3 million — $5.2 million to run schools, about $17,862 per student, plus $6.5 million on buildings and equipment. Money in: $7.3 million local (mostly property tax), $6.6 million state, $1.2 million federal. Long-term debt: $12.9 million.
Spent $6.4 million — $4.7 million to run schools, about $24,415 per student, plus $1.4 million on buildings and equipment. Money in: $2.9 million local (mostly property tax), $2.6 million state, $1.6 million federal. Long-term debt: $4.4 million.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Very Low compared with other U.S. counties. FEMA estimates natural hazards cost Costilla County about $1.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very Low; social vulnerability: Very High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
38 bridges in Costilla County: 4 in good condition, 34 fair, and 0 poor (0.0%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $5.3 million of work in Costilla County in fiscal 2025, about $1,517 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
General election: Tuesday, November 3, 2026. Ballots mailed to voters: 2026-10-02 to 2026-10-09. Drop boxes open: 2026-10-12. In-person voting at voter centers: 2026-10-19 to 2026-11-03. Last day to register and still get a ballot by mail: 2026-10-26. Last suggested day to mail your ballot back: 2026-10-26. Election Day: 2026-11-03. Last day to fix a signature problem: 2026-11-12.
Source: Colorado Secretary of State, Oct. 2, 2026 · Colorado Secretary of State, Sept. 23, 2026 · Colorado Secretary of State — Election Day FAQs
The budget, property tax rates, audits, local officials and offices for Costilla County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have Costilla County built: brayden.ozark@gmail.com.
More of Colorado: the state government and every county in Colorado.
Nearby counties: Alamosa County (28 mi) · Huerfano County (38 mi) · Conejos County (41 mi) · Taos County, NM (50 mi) · Custer County (57 mi) · Rio Grande County (58 mi).