ZIP code 61251 is officially located in the state of Illinois, primarily serving the city of Fenton. It falls under the administrative jurisdiction of Whiteside County. When planning mail delivery, logistics routing, or demographic research, 61251 operates within the Central Time (CT) timezone and supports the 446 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 61251 ZIP Code Tabulation Area is approximately 35,446. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $107,251.