How many people live in Grant County, SD?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 7,600 people living in Grant County, SD. That makes Grant County the 23rd-most populous county in South Dakota. It is home to 0.81% of people living in the state.
7.62K
population of Grant County, SD (2024)
0.81%
County share of the South Dakota population (2024)
About 7,600 people lived in Grant County, SD in 2024.
Population estimates, 2000–2024
What are Grant County, SD’s age demographics?
About 1,900 Grant County residents are aged 65 and older in 2024. That represents 24.9% of its population. For comparison, the age group represents 18.9% of South Dakota’s population and 18% in the US overall.
Another 1,700 Grant County residents, or 22.7% of the population, were children under 18. For comparison, the age group represents 24% of South Dakota’s population and 21.6% in the US overall.
A higher share of Grant County, SD's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Grant County, SD’s racial and ethnic demographics?
Non-Hispanic white residents make up 87.9% of the Grant County, SD population, higher than the national share of 57.5%. Grant County, SD also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (1.1%) than the US overall (0.72%).
In contrast, Grant County’s non-Hispanic Black or African American population accounts for 0.76%, below the 12.6% nationwide, and the Hispanic population makes up 8.7% of the county, compared with 20% 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.
Grant County, SD has a higher share of a non-Hispanic white population than South Dakota as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Grant County, SD is Milbank with about 3,500 residents in 2024.
Cities and towns in Grant County, SD ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Milbank | 3,545 |
| 2. | Alban | 619 |
| 3. | Big Stone City | 413 |
| 4. | Melrose | 383 |
| 5. | Grant Center | 379 |
| 6. | Big Stone | 321 |
| 7. | Vernon | 220 |
| 8. | Blooming Valley | 178 |
| 9. | Osceola | 159 |
| 10. | Adams | 158 |
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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.
