ZIP code 61477 is officially located in the state of Illinois, primarily serving the city of Smithfield. It falls under the administrative jurisdiction of Fulton County. When planning mail delivery, logistics routing, or demographic research, 61477 operates within the Central Time (CT) timezone and supports the 851 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 61477 ZIP Code Tabulation Area is approximately 42,151. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $49,477.