ZIP code 57240 is officially located in the state of South dakota, primarily serving the city of Grenville. It falls under the administrative jurisdiction of Day County. When planning mail delivery, logistics routing, or demographic research, 57240 operates within the Central Time (CT) timezone and supports the 484 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 57240 ZIP Code Tabulation Area is approximately Data Not Available. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $120,240.