Sierra County's 2026 population is estimated at 11,097, reflecting a -1.3% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Sierra County is the 25th largest county in New Mexico. The 2010 population was 12,043 and has grown -7.86% since 2010.
Data after 2023 is projected based on recent change
Overall: 57.6 years
Female: 57.4 years
Male: 59.4 years
There are 9,705 adults, (4,465 of whom are seniors) in Sierra County.
Female: 5,813 (50.5%)
Male: 5,687 (49.5%)
The racial composition of Sierra County includes 69.31% White, 7.35% other race, and smaller percentages for Native American, Black or African American, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 7,971 | 69.31% |
| Two or more races | 2,554 | 22.21% |
| Other race | 845 | 7.35% |
| Native American | 87 | 0.76% |
| Black or African American | 25 | 0.22% |
| Asian | 18 | 0.16% |
Sierra County 's average per capita income is $27,750. Household income levels show a median of $41,600. The poverty rate stands at 21.38%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $75,801 | - |
| Families | $67,656 | $73,635 |
| Households | $41,600 | $54,369 |
| Non Families | $27,261 | $34,928 |
Average Income
Median Household Income
Poverty Rate