How many people live in Williams County, ND?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 40,800 people living in Williams County, ND. That makes Williams County the fifth-most populous county in North Dakota. It is home to 5.1% of people living in the state.
40.8K
population of Williams County, ND (2024)
5.1%
County share of the North Dakota population (2024)
About 40,800 people lived in Williams County, ND in 2024.
Population estimates, 2000–2024
What are Williams County, ND’s age demographics?
About 4,400 Williams County, ND residents are aged 65 and older in 2024. That represents 10.8% of its population. For comparison, the age group represents 17.5% of North Dakota’s population and 18% in the US overall.
Another 12,300 Williams County residents, or 30.1% of the population, were children under 18. For comparison, the age group represents 23.5% of North Dakota’s population and 21.6% in the US overall.
A higher share of Williams County, ND's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Williams County, ND’s racial and ethnic demographics?
Non-Hispanic white residents make up 74.4% of the Williams County, ND population, higher than the national share of 57.5%. Williams County, ND also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (3.7%) than the US overall (0.72%).
In contrast, Williams County’s Hispanic population accounts for 11.5%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 5.1% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Williams County, ND has a higher share of a Hispanic population than North Dakota as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Williams County, ND is Williston with about 28,800 residents in 2024.
Cities and towns in Williams County, ND ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Williston | 28,821 |
| 2. | Tioga | 2,177 |
| 3. | Missouri Ridge | 1,618 |
| 4. | Williston | 1,093 |
| 5. | Pherrin | 924 |
| 6. | Stony Creek | 825 |
| 7. | Ray | 756 |
| 8. | Trenton | 658 |
| 9. | Round Prairie | 398 |
| 10. | Judson | 378 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
