Spearfish is a city in Lawrence County, South Dakota, United States. The population was 12,193 at the time of the 2020 census, making it the …Spearfish is a city in Lawrence County, South Dakota, United States. The population was 12,193 at the time of the 2020 census, making it the 10th 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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