ZIP code 57520 is officially located in the state of South dakota, primarily serving the city of Agar. It falls under the administrative jurisdiction of Sully County. When planning mail delivery, logistics routing, or demographic research, 57520 operates within the Central Time (CT) timezone and supports the 810 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 57520 ZIP Code Tabulation Area is approximately 7,110. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $80,520.