ZIP code 54648 is officially located in the state of Wisconsin, primarily serving the city of Norwalk. It falls under the administrative jurisdiction of Monroe County. When planning mail delivery, logistics routing, or demographic research, 54648 operates within the Central Time (CT) timezone and supports the 610 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 54648 ZIP Code Tabulation Area is approximately 34,210. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $56,648.