ZIP code 49240 is officially located in the state of Michigan, primarily serving the city of Grass lake. It falls under the administrative jurisdiction of Jackson County. When planning mail delivery, logistics routing, or demographic research, 49240 operates within the Eastern Time (ET) timezone and supports the 812 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 49240 ZIP Code Tabulation Area is approximately 18,312. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $120,240.