ZIP code 99020 is officially located in the state of Washington, primarily serving the city of Marshall. It falls under the administrative jurisdiction of Spokane County. When planning mail delivery, logistics routing, or demographic research, 99020 operates within the Pacific Time (PT) timezone and supports the 255 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 99020 ZIP Code Tabulation Area is approximately 22,655. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $80,020.