ZIP code 62003 is officially located in the state of Illinois, primarily serving the city of Alton. It falls under the administrative jurisdiction of Madison County. When planning mail delivery, logistics routing, or demographic research, 62003 operates within the Central Time (CT) timezone and supports the 477 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 62003 ZIP Code Tabulation Area is approximately Data Not Available. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $91,003.