ZIP code 57657 is officially located in the state of South dakota, primarily serving the city of Trail city. It falls under the administrative jurisdiction of Corson County. When planning mail delivery, logistics routing, or demographic research, 57657 operates within the Central Time (CT) timezone and supports the 317 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 57657 ZIP Code Tabulation Area is approximately 17,817. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $109,657.