ZIP code 61442 is officially located in the state of Illinois, primarily serving the city of Keithsburg. It falls under the administrative jurisdiction of Mercer County. When planning mail delivery, logistics routing, or demographic research, 61442 operates within the Central Time (CT) timezone and supports the 542 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 61442 ZIP Code Tabulation Area is approximately 36,942. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $54,442.