How many people live in Bennett County, SD?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 3,300 people living in Bennett County, SD. That makes Bennett County the 45th-most populous county in South Dakota. It is home to 0.35% of people living in the state.
3.29K
population of Bennett County, SD (2024)
0.35%
County share of the South Dakota population (2024)
About 3,300 people lived in Bennett County, SD in 2024.
Population estimates, 2000–2024
What are Bennett County, SD’s age demographics?
About 475 Bennett County residents are aged 65 and older in 2024. That represents 14.4% of its population. For comparison, the age group represents 18.9% of South Dakota’s population and 18% in the US overall.
Another 1,000 Bennett County, SD residents, or 30.6% 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 Bennett County, SD's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Bennett County, SD’s racial and ethnic demographics?
Non-Hispanic American Indian and Alaska Native residents make up 57.3% of the Bennett County, SD population, higher than the national share of 0.72%. Bennett County also has a larger share of people identifying as non-Hispanic two or more races (5.5%) than the US overall (2.5%).
In contrast, Bennett County’s non-Hispanic white population accounts for 31.6%, below the 57.5% nationwide, and the Hispanic population makes up 3.7% 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.
Bennett County, SD has a higher share of a non-Hispanic American Indian and Alaska Native population than South Dakota as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Bennett County, SD is Martin with about 923 residents in 2024.
Cities and towns in Bennett County, SD ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Martin | 923 |
| 2. | Balance of Bennett County | 2,366 |
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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.
