What is the population of watertown, sd?
<answer> The population of Watertown, South Dakota is 22,057. <context> Population of Watertown, SD. Last official estimated population of Watertown city (Codington County**, South Dakota state) was 22,057 (year 2014) [1]. This was 0.007% of total US population and 2.57% of total South Dakota state population. Area of Watertown city is 25.8 mi² (=66.8 km²) [6], in this year population density was 855.12 p/mi². If population growth rate would be same as in period 2010-2014 (+0.66%/yr), Watertown city population in 2018 would be 22,647*.