Post Falls is a city in Kootenai County, Idaho, between Coeur d'Alene and Spokane, Washington. It is a suburb of Coeur d'Alene, to the east, and a bedroom community to Spokane, to the west. The population was 27,574 at the time of the 2010 census, up from 17,247 in the 2000 census, making it Idaho's tenth-largest city. The U.S. Census Bureau estimated 2019 population is 36,250.