ZIP code 61071 is officially located in the state of Illinois, primarily serving the city of Rock falls. It falls under the administrative jurisdiction of Whiteside County. When planning mail delivery, logistics routing, or demographic research, 61071 operates within the Central Time (CT) timezone and supports the 227 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 61071 ZIP Code Tabulation Area is approximately 23,327. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $47,071.