ZIP code 54138 is officially located in the state of Wisconsin, primarily serving the city of Lakewood. It falls under the administrative jurisdiction of Oconto County. When planning mail delivery, logistics routing, or demographic research, 54138 operates within the Central Time (CT) timezone and supports the 521 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 54138 ZIP Code Tabulation Area is approximately 34,821. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $86,138.