ZIP code 99301 is officially located in the state of Washington, primarily serving the city of Pasco. It falls under the administrative jurisdiction of Franklin County. When planning mail delivery, logistics routing, or demographic research, 99301 operates within the Pacific Time (PT) timezone and supports the 435 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 99301 ZIP Code Tabulation Area is approximately 19,335. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $57,301.