How many people live in Slope County, ND?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 660 people living in Slope County, ND. That makes Slope County the 53rd-most populous county in North Dakota. It is home to 0.08% of people living in the state.
660
population of Slope County, ND (2024)
0.08%
County share of the North Dakota population (2024)
About 660 people lived in Slope County, ND in 2024.
Population estimates, 2000–2024
What are Slope County, ND’s age demographics?
About 237 Slope County, ND residents are aged 65 and older in 2024. That represents 35.9% of its population. For comparison, the age group represents 17.5% of North Dakota’s population and 18% in the US overall.
Another 117 Slope County, ND residents, or 17.7% 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 Slope County, ND's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Slope County, ND’s racial and ethnic demographics?
Non-Hispanic white residents make up 95.6% of the Slope County population, higher than the national share of 57.5%. Slope County also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (2.1%) than the US overall (0.72%).
In contrast, Slope County’s Hispanic population accounts for 0.61%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 1.1% 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.
Slope County, ND has a higher share of a non-Hispanic white population than North Dakota as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Slope County, ND is Marmarth with about 94 residents in 2024.
Cities and towns in Slope County, ND ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Marmarth | 94 |
| 2. | Northwest Slope UT | 52 |
| 3. | Northeast Slope UT | 45 |
| 4. | Rainy Butte | 36 |
| 5. | Cash | 34 |
| 6. | Sand Creek | 34 |
| 7. | Woodberry | 32 |
| 8. | Connor | 31 |
| 9. | Cedar Creek | 29 |
| 10. | Moord | 29 |
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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.
