Costilla County's 2026 population is estimated at 3,810, reflecting a 1.65% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Costilla County is the 55th largest county in Colorado. The 2010 population was 3,529 and has grown 7.96% since 2010.
Data after 2023 is projected based on recent change
Overall: 50.5 years
Female: 48.4 years
Male: 53.3 years
There are 2,936 adults, (1,029 of whom are seniors) in Costilla County.
Female: 1,756 (48.7%)
Male: 1,851 (51.3%)
The racial composition of Costilla County includes 44.22% White, 8.73% other race, 4.49% Native American, and smaller percentages for Black or African American, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 1,595 | 44.22% |
| Two or more races | 1,389 | 38.51% |
| Other race | 315 | 8.73% |
| Native American | 162 | 4.49% |
| Black or African American | 91 | 2.52% |
| Asian | 55 | 1.52% |
Costilla County 's average per capita income is $31,222. Household income levels show a median of $36,861. The poverty rate stands at 21%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $69,250 | - |
| Families | $50,104 | $67,071 |
| Households | $36,861 | $54,653 |
| Non Families | $16,667 | $34,014 |
Average Income
Median Household Income
Poverty Rate
