ZIP code 54121 is officially located in the state of Wisconsin, primarily serving the city of Florence. It falls under the administrative jurisdiction of Florence County. When planning mail delivery, logistics routing, or demographic research, 54121 operates within the Central Time (CT) timezone and supports the 316 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 54121 ZIP Code Tabulation Area is approximately 21,316. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $97,121.