Post Falls is a city located in Kootenai County, Idaho, in the United States. It serves as a gateway to Northern Idaho, situated off Interstate 90 between Spokane, Washington, to the west and Coeur d'Alene to the east.
As of a 2022 U.S. Census Bureau estimate, the city has a population of approximately 44,194. This figure makes Post Falls the ninth-largest city in Idaho and the second-largest city in North Idaho, following Coeur d'Alene.