ZIP code 50638 is officially located in the state of Iowa, primarily serving the city of Grundy center. It falls under the administrative jurisdiction of Grundy County. When planning mail delivery, logistics routing, or demographic research, 50638 operates within the Central Time (CT) timezone and supports the 317 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 50638 ZIP Code Tabulation Area is approximately 17,817. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $86,638.