Spearfish is a city in Lawrence County, South Dakota, United States. The population was 12,193 at the 2020 census, and was estimated to be …Spearfish is a city in Lawrence County, South Dakota, United States. The population was 12,193 at the 2020 census, and was estimated to be 13,282 in 2023, making it the 11th most populous city in South Dakota. Spearfish is the largest city in Lawrence County and the home of Black Hills State University.
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