Mountrail County's 2026 population is estimated at 9,568, reflecting a 0.49% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Mountrail County is the 16th largest county in North Dakota. The 2010 population was 7,708 and has grown 24.13% since 2010.
Data after 2023 is projected based on recent change
Overall: 35.4 years
Female: 35.5 years
Male: 35.2 years
There are 6,747 adults, (1,285 of whom are seniors) in Mountrail County.
Female: 4,639 (48.8%)
Male: 4,868 (51.2%)
The racial composition of Mountrail County includes 57.69% White, 28.93% Native American, and smaller percentages for other race, Black or African American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 5,485 | 57.69% |
| Native American | 2,750 | 28.93% |
| Two or more races | 779 | 8.19% |
| Other race | 249 | 2.62% |
| Black or African American | 175 | 1.84% |
| Asian | 54 | 0.57% |
| Native Hawaiian or Pacific Islander | 15 | 0.16% |
Mountrail County 's average per capita income is $52,194. Household income levels show a median of $80,717. The poverty rate stands at 14.52%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $117,778 | - |
| Families | $100,000 | $121,763 |
| Households | $80,717 | $106,551 |
| Non Families | $61,779 | $79,460 |
Average Income
Median Household Income
Poverty Rate