Williams County's 2026 population is estimated at 43,681, reflecting a 3.46% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Williams County is the 5th largest county in North Dakota. The 2010 population was 22,591 and has grown 93.36% since 2010.
Data after 2023 is projected based on recent change
Overall: 31.8 years
Female: 31.8 years
Male: 31.9 years
There are 27,621 adults, (3,934 of whom are seniors) in Williams County.
Female: 18,647 (47.1%)
Male: 20,908 (52.9%)
The racial composition of Williams County includes 79.87% White, 4.7% Black or African American, 3.23% other race, 3.08% Native American, and smaller percentages for Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 31,591 | 79.87% |
| Two or more races | 3,078 | 7.78% |
| Black or African American | 1,858 | 4.7% |
| Other race | 1,279 | 3.23% |
| Native American | 1,218 | 3.08% |
| Asian | 481 | 1.22% |
| Native Hawaiian or Pacific Islander | 50 | 0.13% |
Williams County 's average per capita income is $57,824. Household income levels show a median of $85,595. The poverty rate stands at 8.64%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $131,974 | - |
| Families | $105,410 | $140,388 |
| Households | $85,595 | $117,741 |
| Non Families | $53,750 | $74,284 |
Average Income
Median Household Income
Poverty Rate