Post Falls is a city in Kootenai County, Idaho, United States near the Idaho state line between Spokane, Washington, and Coeur d'Alene, Idaho. The population was 17,247 at the 2000 census, but now as of 2006 it has 24,420 citizens. Post Falls apartments for rent comparison page shows most up to date rent information on Post Falls apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.