ZIP code 99163 is officially located in the state of Washington, primarily serving the city of Pullman. It falls under the administrative jurisdiction of Whitman County. When planning mail delivery, logistics routing, or demographic research, 99163 operates within the Pacific Time (PT) timezone and supports the 866 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 99163 ZIP Code Tabulation Area is approximately 28,166. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $111,163.