Spencer is a city located in South Dakota. With a 2020 population of 149, it is the 201st largest city in South Dakota and the 17490th largest city in the United States. Spencer is currently growing at a rate of 1.36% annually but its population has decreased by -3.25% since the most recent census, which recorded a population of 154 in 2010. Spencer reached it's highest population of 153 in 2010. Spanning over 0 miles, Spencer has a population density of 556 people per square mile.
The average household income in Spencer is $62,167 with a poverty rate of 17.69%. The median rental costs in recent years comes to - per month, and the median house value is $70,800. The median age in Spencer is 52.8 years, 48.4 years for males, and 54.8 years for females. For every 100 females there are 119.4 males.