ZIP code 99140 is officially located in the state of Washington, primarily serving the city of Keller. It falls under the administrative jurisdiction of Ferry County. When planning mail delivery, logistics routing, or demographic research, 99140 operates within the Pacific Time (PT) timezone and supports the 530 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 99140 ZIP Code Tabulation Area is approximately 13,830. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $120,140.