Flandreau is a city located in South Dakota. With a 2020 population of 2,317, it is the 33rd largest city in South Dakota and the 7083rd largest city in the United States. Flandreau is currently declining at a rate of -0.17% annually and its population has decreased by -1.03% since the most recent census, which recorded a population of 2,341 in 2010. Flandreau reached it's highest population of 2,339 in 2010. Spanning over 2 miles, Flandreau has a population density of 1,247 people per square mile.
The average household income in Flandreau is $54,183 with a poverty rate of 15.66%. The median rental costs in recent years comes to $550 per month, and the median house value is $88,600. The median age in Flandreau is 36.3 years, 34.8 years for males, and 37.9 years for females. For every 100 females there are 99.5 males.