Olean township is located in Spink County, South Dakota. Olean township has a 2025 population of 38. Olean township is currently declining at a rate of -2.56% annually and its population has decreased by -9.52% since the most recent census, which recorded a population of 42 in 2020.
Data after 2023 is projected based on recent change
Race | Population | Percentage (of total) |
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No results. |
Married
Widowed
Divorced
Separated
Never Married