Foster County's 2026 population is estimated at 3,301, reflecting a -0.33% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Foster County is the 32nd largest county in North Dakota. The 2010 population was 3,343 and has grown -1.26% since 2010.
Data after 2023 is projected based on recent change
Overall: 43.4 years
Female: 48.8 years
Male: 41.6 years
There are 2,627 adults, (810 of whom are seniors) in Foster County.
Female: 1,616 (48.1%)
Male: 1,742 (51.9%)
The racial composition of Foster County includes 94.25% White, and smaller percentages for Two or more races, Asian, other race, Black or African American, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 3,165 | 94.25% |
| Two or more races | 96 | 2.86% |
| Asian | 61 | 1.82% |
| Other race | 21 | 0.63% |
| Black or African American | 10 | 0.3% |
| Native American | 5 | 0.15% |
Foster County 's average per capita income is $51,761. Household income levels show a median of $87,831. The poverty rate stands at 8.77%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $117,370 | - |
| Families | $115,703 | $129,283 |
| Households | $87,831 | $103,534 |
| Non Families | $45,375 | $59,750 |
Average Income
Median Household Income
Poverty Rate