ZIP code 99161 is officially located in the state of Washington, primarily serving the city of Palouse. It falls under the administrative jurisdiction of Whitman County. When planning mail delivery, logistics routing, or demographic research, 99161 operates within the Pacific Time (PT) timezone and supports the 348 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 99161 ZIP Code Tabulation Area is approximately 29,748. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $77,161.