County · Colorado
Costilla County, Colorado
Costilla County, Colorado. Costilla County had 3,679 residents in 2025 by the Census Bureau's estimate, up 5.3% since 2020, faster than Colorado (+4.1%). It holds 4 places (2 cities, villages and boroughs and 2 census-designated) and 2 census tracts. GEOID 08023.
Costilla County is one of the 3 counties of the Alamosa, CO micropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
3,679
Census Bureau estimate (no margin published)
2020 Census count: 3,499 · ACS 2020-2024: 3,607
Median household income
$36,861
±$6,112 (90% margin)
Colorado: $95,470
Median home value
$184,700
±$34,905 (90% margin)
Colorado: $539,400
Median gross rent
$927
±$134 (90% margin)
Colorado: $1,761
How many people live in Costilla County, and is it growing?
The 2020 Census counted 3,499 residents in Costilla County. The Census Bureau estimates 3,679 for July 1, 2025, up 5.3% since 2020, faster than Colorado (+4.1%). The 2020-2024 American Community Survey puts the population at 3,607 over 1,228 square miles of land.
| Measure | Costilla County | Colorado | Change since 2015-2019 |
|---|---|---|---|
| Total population | 3,607 | 5,862,189 | −138 |
| Households | 1,651±111 | 2,374,218 | no clear change |
| Average household size | 2.17±0.15 | 2.42 | no clear change |
| Housing units | 2,433±24 | 2,589,053 | −412 |
Costilla County's population since 2000
From 3,663 in 2000 to 3,679 in 2025: up 0.4%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Costilla County?
Costilla County holds 4 places: 2 cities, villages and boroughs (incorporated places) and 2 census-designated places. The largest is San Luis with 597 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| San Luis | 598 | $26,708 |
|---|---|---|
| Fort Garland | 464 | not published |
| BlancaGEOID 0807190 | 322 | $68,000 |
| San AcacioGEOID 0867500 | 56 | not published |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Costilla County?
The median resident of Costilla County is 50.5 years old; 18.6% are under 18 and 28.5% are 65 or older. The largest group is Hispanic or Latino residents (of any race) at 54.7%, then non-Hispanic white residents at 37.3%. 5.7% of residents were born outside the United States.
| Measure | Costilla County | Colorado | Change since 2015-2019 |
|---|---|---|---|
| Median age | 50.5±1.7 | 37.7 | no clear change |
| Under 18 years | 18.6%±0.7 pts | 21.0% | – |
| 65 years and over | 28.5%±0.9 pts | 15.6% | – |
| Hispanic or Latino (any race) | 54.7% | 22.5% | −7.2 pts |
| White alone, not Hispanic | 37.3%±0.7 pts | 64.8% | +3.9 pts |
| Black or African American alone, not Hispanic | 1.9%±0.3 pts | 3.8% | – |
| Asian alone, not Hispanic | 1.5%±0.5 pts | 3.2% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.2 pts | 0.4% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.2 pts | 0.1% | – |
| Two or more races, not Hispanic | 4.4%±0.9 pts | 4.6% | – |
| Some other race alone, not Hispanic | 0.0%±1.2 pts | 0.5% | – |
| Born outside the United States | 5.7%±1.8 pts | 9.8% | −3.5 pts |
| Speak a language other than English at home (age 5+) | 29.2%±3.8 pts | 16.2% | – |
| Civilian veterans (age 18+) | 12.2%±2.9 pts | 7.5% | – |
| With a disability | 22.6%±3.8 pts | 11.4% | – |
| No health insurance coverage | 8.5%±2.3 pts | 7.7% | no clear change |
| High school graduate or higher (age 25+) | 90.0%±3.0 pts | 92.9% | – |
| Bachelor's degree or higher (age 25+) | 24.9%±3.9 pts | 45.7% | +5.6 pts |
| Graduate or professional degree (age 25+) | 7.7%±2.5 pts | 17.6% | – |
| Moved from another state in the past year | 6.1%±2.2 pts | 3.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Costilla County earn?
Half of Costilla County's 1,651 households earn less than $36,861 a year (±$6,112), against $95,470 in Colorado. In 2015-2019 it was $38,108 in 2024 dollars; the margins of error cannot tell the two periods apart. 21.0% of residents live below the poverty line.
| Measure | Costilla County | Colorado | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $36,861±$6,112 | $95,470 | no clear change |
| Mean household income | $54,653±$8,146 | $128,255 | – |
| Per capita income | $28,445±$3,148 | $52,636 | no clear change |
| People below the poverty line | 21.0%±5.2 pts | 9.4% | no clear change |
| Children under 18 below the poverty line | 18.5%±9.7 pts | 11.1% | −20.7 pts |
| Households receiving SNAP | 29.1%±4.5 pts | 8.5% | – |
| Households with a broadband subscription | 88.1%±4.1 pts | 93.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Costilla County?
Owners occupy 79.0% of Costilla County's occupied homes and renters 21.0%. The median owner-occupied home is valued at $184,700 by its owner (±$34,905). The median renter pays $927 a month including utilities, and 45.8% of renters pay 35% or more of their income on rent.
| Measure | Costilla County | Colorado | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $184,700±$34,905 | $539,400 | +$45,632 |
| Median gross rent | $927±$134 | $1,761 | +$272 |
| Renters paying 35% or more of income on rent | 45.8%±16.6 pts | 42.7% | no clear change |
| Median monthly owner costs, with a mortgage | $1,276±$150 | $2,326 | – |
| Owner-occupied homes | 79.0%±4.8 pts | 66.2% | +10.0 pts |
| Housing units | 2,433±24 | 2,589,053 | −412 |
| Homeowner vacancy rate | 3.2%±3.9 pts | 0.8% | – |
| Rental vacancy rate | 0.0%±11.5 pts | 5.1% | – |
| Single-family detached homes | 81.1%±3.5 pts | 61.4% | – |
| Mobile homes | 13.7%±3.0 pts | 3.5% | – |
| Built 2020 or later | 3.3%±1.8 pts | 3.0% | – |
| Built 1939 or earlier | 14.0%±3.8 pts | 7.0% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Costilla County building?
Builders took permits for 114 new housing units across Costilla County in 2025 (114 single-family), 31.0 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Costilla County get to work?
68.0% of Costilla County's workers drive alone and 16.1% work from home. The average trip to work takes 26.1 minutes. The unemployment rate in 2020-2024 averaged 3.5%.
| Measure | Costilla County | Colorado | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 44.0%±4.1 pts | 68.6% | – |
| Unemployment rate | 3.5%±2.0 pts | 4.6% | −6.1 pts |
| Drove alone to work | 68.0%±5.7 pts | 65.1% | – |
| Carpooled | 9.3%±4.2 pts | 7.7% | – |
| Public transportation | 0.0%±3.4 pts | 1.6% | – |
| Walked | 5.9%±2.1 pts | 2.5% | – |
| Worked from home | 16.1%±5.2 pts | 21.0% | +9.4 pts |
| Mean travel time to work | 26.1 min±6.0 | 25.2 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Costilla County's census tracts?
Costilla County is divided into 2 census tracts. Among those with a reliable estimate, median household income runs from $33,409 (Tract 9727) to $38,894 (Tract 9726).
| Tract 972608023972600 | 1,691±185 | $38,894 |
|---|---|---|
| Tract 972708023972700 | 1,916±185 | $33,409 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Costilla County compare with Colorado's other counties?
| Measure | Rank |
|---|---|
| Population | 55th of 64 |
| Growth 2020-2025 | 13th of 64 |
| Residents per square mile | 51st of 64 |
| Median household income | 64th of 64 |
| Median home value | 57th of 64 |
| Median gross rent | 50th of 63 |
| Poverty rate | 6th of 63 |
| Bachelor's degree or higher | 50th of 64 |
| Median age | 10th of 64 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Costilla County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.