ZIP code 61277 is officially located in the state of Illinois, primarily serving the city of Prophetstown. It falls under the administrative jurisdiction of Whiteside County. When planning mail delivery, logistics routing, or demographic research, 61277 operates within the Central Time (CT) timezone and supports the 527 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 61277 ZIP Code Tabulation Area is approximately 19,427. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $49,277.