ZIP code 98611 is officially located in the state of Washington, primarily serving the city of Castle rock. It falls under the administrative jurisdiction of Cowlitz County. When planning mail delivery, logistics routing, or demographic research, 98611 operates within the Pacific Time (PT) timezone and supports the 508 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 98611 ZIP Code Tabulation Area is approximately 6,108. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $127,611.