ZIP code 48421 is officially located in the state of Michigan, primarily serving the city of Columbiaville. It falls under the administrative jurisdiction of Lapeer County. When planning mail delivery, logistics routing, or demographic research, 48421 operates within the Eastern Time (ET) timezone and supports the 629 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 48421 ZIP Code Tabulation Area is approximately 12,529. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $97,421.