ZIP code 99135 is officially located in the state of Washington, primarily serving the city of Hartline. It falls under the administrative jurisdiction of Grant County. When planning mail delivery, logistics routing, or demographic research, 99135 operates within the Pacific Time (PT) timezone and supports the 852 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 99135 ZIP Code Tabulation Area is approximately 35,152. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $135,135.