ZIP code 62991 is officially located in the state of Illinois, primarily serving the city of Tunnel hill. It falls under the administrative jurisdiction of Johnson County. When planning mail delivery, logistics routing, or demographic research, 62991 operates within the Central Time (CT) 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 62991 ZIP Code Tabulation Area is approximately 32,312. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $87,991.