Costilla County, Colorado Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 55th-largest in Colorado
The population of Costilla County, Colorado is 3,571 as of the 2023 American Community Survey, making it the 55th-largest county in Colorado. The median household income is $36,519, the median home value is $171,300, and the median age is 50.7.
The population of Costilla County has grown 4.4% since 2010 (3,529 → 3,686), a +0.31% annualized rate.
3,571
Population
+0.31%
Annual growth
3
People / sq mi
$36,519
Median Income
$171,300
Median Home Value
Costilla County covers 1,228 sq mi of land at 2.9 people per square mile.
About Costilla County, CO
Costilla County is a county in Colorado with a population of 3,571. It ranks #55 among counties in Colorado by population. The median age is 50.7, older than the national median. The population is 50.4% male and 49.6% female.
The median household income in Costilla County is $36,519, below the US median of $74,580. 21.1% of residents live below the federal poverty level. Home values sit at a median of $171,300, with monthly rent averaging $857. The homeownership rate of 78.5% is higher than the national rate of 64.8%.
Educational attainment in Costilla County reflects 27.8% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 12.6% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 27.5 minutes each way.
Costilla County Population History (2010-2024)
The county of Costilla County had a population of 3,529 in 2010 and 3,686 in 2024, a 4.4% growth over 14 years. The peak was 3,872 in 2019. Average annual growth rate: 0.36%.
3,686
Population (2024)
3,529
Population (2010)
3,872
Peak (2019)
0.36%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 3,529 |
| 2011 | 3,640 |
| 2012 | 3,601 |
| 2013 | 3,540 |
| 2014 | 3,560 |
| 2015 | 3,576 |
| 2016 | 3,692 |
| 2017 | 3,758 |
| 2018 | 3,803 |
| 2019 | 3,872 |
| 2020 | 3,501 |
| 2021 | 3,614 |
| 2022 | 3,609 |
| 2023 | 3,624 |
| 2024 | 3,686 |
Race & Ethnicity
| White | 52.4% |
| Black or African American | 3.5% |
| Asian | 0.8% |
| Hispanic or Latino (any race) | 7.8% |
| Two or More Races | 0.0% |
Age & Sex
50.7
Median Age
49.6%
Female
50.4%
Male
27.5%
Age 65+
Age Distribution
Children (under 15): 15.5% · Seniors (65+): 27.5%
Income & Poverty
| Median household income | $36,519$-55,951 vs state |
| Mean household income | $57,688 |
| Per-capita income | $27,976 |
| Poverty rate | 21.1%+15.2% vs state |
| Unemployment rate | 2.0% |
| Employment-to-population | 41.8% |
Top Industries by Employment
The largest employment sector in Costilla County is professional & business services, accounting for 33.0% of workers.
How residents commute
0.0%
Drive alone
3.7%
Carpool
70.2%
Public transit
12.6%
Work from home
27.5 min
Avg commute
Housing
$171,300$-330,900 vs state
Median home value
$857
Median rent
78.5%
Homeownership rate
2,418
Total housing units
65.1%
Occupied
34.9%
Vacant
21.5%
Renter-occupied
Social & access
91.7%
With health insurance
93.9%
With broadband internet
45.6%
Foreign-born
11.8%
Veterans (18+)
23.7%
With a disability
68.5%
Speak language other than English at home
Education
89.7%
High School+
27.8%
Bachelor's+
Largest cities in Colorado
Other counties in Colorado
Part of Colorado
Metro areas in Colorado
County rankings
Frequently Asked Questions
Costilla County, Colorado has a population of 3,571 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 55th-largest county in Colorado. Population density is 3 people per square mile.
The population of Costilla County has grown 4.4% since 2010 (3,529 → 3,686), a +0.31% annualized rate.
The median household income in Costilla County, Colorado is $36,519, with mean (average) household income of $57,688 and per-capita income of $27,976. 21.1% of residents live below the federal poverty level.
In Costilla County, the largest racial and ethnic groups are White (52.4%), Hispanic or Latino (7.8%), Black or African American (3.5%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Costilla County, Colorado is 50.7 years. Residents are 49.6% female and 50.4% male.
The median home value in Costilla County is $171,300 and median monthly rent is $857. 78.5% of occupied housing units are owner-occupied. The county has 2,418 total housing units, 34.9% of which are vacant.
The largest employment sector in Costilla County, Colorado is professional, scientific, and management services, employing 33.0% of workers. The unemployment rate is 2.0%.
Denver is among the largest cities associated with Costilla County, Colorado, with a population of 713,734.
More from Colorado
Population 736,008
Population 713,734
Population 655,709
Population 579,715
Full rankings of Colorado counties
Statewide data for Colorado
Population, race, income, age, and trends across Colorado
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.