ZIP code 61531 is officially located in the state of Illinois, primarily serving the city of Middlegrove. It falls under the administrative jurisdiction of Fulton County. When planning mail delivery, logistics routing, or demographic research, 61531 operates within the Central Time (CT) timezone and supports the 218 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 61531 ZIP Code Tabulation Area is approximately 14,218. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $67,531.