Greenacres is a locale and former census-designated place (CDP) in Spokane County, Washington, United States. The locale is almost entirely split between the city of Spokane Valley and unincorporated Spokane County, with a small portion being located within the city of Liberty Lake. Greenacres retains its own post office.

Spokane County is a county located in the U.S. state of Washington. As of the 2020 census, its population was 539,339, making it the fourth-most populous county in Washington. The largest city and county seat is Spokane, the second largest city in the state after Seattle. The county is named after the Spokane tribe.