Selby is a city located in South Dakota. With a 2020 population of 662, it is the 96th largest city in South Dakota and the 12141st largest city in the United States. Selby is currently growing at a rate of 1.07% annually and its population has increased by 3.12% since the most recent census, which recorded a population of 642 in 2010. Spanning over 1 miles, Selby has a population density of 930 people per square mile.
The average household income in Selby is $68,950 with a poverty rate of 8.41%. The median rental costs in recent years comes to $538 per month, and the median house value is $61,100. The median age in Selby is 48.6 years, 48.5 years for males, and 48.8 years for females. For every 100 females there are 102.9 males.