ZIP code 98603 is officially located in the state of Washington, primarily serving the city of Ariel. It falls under the administrative jurisdiction of Cowlitz County. When planning mail delivery, logistics routing, or demographic research, 98603 operates within the Pacific Time (PT) timezone and supports the 865 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 98603 ZIP Code Tabulation Area is approximately 28,865. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $91,603.