ZIP code 54403 is officially located in the state of Wisconsin, primarily serving the city of Wausau. It falls under the administrative jurisdiction of Marathon County. When planning mail delivery, logistics routing, or demographic research, 54403 operates within the Central Time (CT) timezone and supports the 823 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 54403 ZIP Code Tabulation Area is approximately 43,523. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $91,403.