Spearfish is a city located in South Dakota. With a 2020 population of 12,084, it is the 10th largest city in South Dakota and the 2712th largest city in the United States. Spearfish is currently growing at a rate of 1.67% annually and its population has increased by 15.15% since the most recent census, which recorded a population of 10,494 in 2010. Spanning over 16 miles, Spearfish has a population density of 734 people per square mile.
The average household income in Spearfish is $71,253 with a poverty rate of 12.78%. The median rental costs in recent years comes to $724 per month, and the median house value is $211,100. The median age in Spearfish is 35.8 years, 35 years for males, and 37.9 years for females. For every 100 females there are 91.9 males.