Spearfish is a city located in Lawrence County South Dakota. With a 2020 population of 11,934, it is the 10th largest city in South Dakota and the 2733rd largest city in the United States . Spearfish is currently growing at a rate of 0.75% annually and its population has increased by 13.72% since the most recent census, which recorded a population of 10,494 in 2010. Spearfish reached it's highest population of 11,934 in 2021. Spanning over 16 miles, Spearfish has a population density of 725 people per square mile.
The average household income in Spearfish is $73,951 with a poverty rate of 13.83%. The median rental costs in recent years comes to $763 per month, and the median house value is $212,700. The median age in Spearfish is 36.1 years, 34.6 years for males, and 37.9 years for females.