ZIP code 48631 is officially located in the state of Michigan, primarily serving the city of Kawkawlin. It falls under the administrative jurisdiction of Bay County. When planning mail delivery, logistics routing, or demographic research, 48631 operates within the Eastern Time (ET) timezone and supports the 650 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 48631 ZIP Code Tabulation Area is approximately 38,450. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $67,631.