Sweet Grass County's 2026 population is estimated at 3,773, reflecting a 0.21% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Sweet Grass County is the 39th largest county in Montana. The 2010 population was 3,617 and has grown 4.31% since 2010.
Data after 2023 is projected based on recent change
Overall: 47 years
Female: 47.6 years
Male: 46.8 years
There are 2,974 adults, (959 of whom are seniors) in Sweet Grass County.
Female: 1,850 (49.7%)
Male: 1,870 (50.3%)
The racial composition of Sweet Grass County includes 90.75% White, and smaller percentages for Native American, other race, Black or African American, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 3,376 | 90.75% |
| Two or more races | 178 | 4.78% |
| Native American | 63 | 1.69% |
| Other race | 57 | 1.53% |
| Black or African American | 39 | 1.05% |
| Asian | 7 | 0.19% |
Sweet Grass County 's average per capita income is $47,661. Household income levels show a median of $77,000. The poverty rate stands at 7.86%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $95,764 | - |
| Families | $92,300 | $124,026 |
| Households | $77,000 | $102,866 |
| Non Families | $40,000 | $55,128 |
Average Income
Median Household Income
Poverty Rate