ZIP code 50131 is officially located in the state of Iowa, primarily serving the city of Johnston. It falls under the administrative jurisdiction of Polk County. When planning mail delivery, logistics routing, or demographic research, 50131 operates within the Central Time (CT) timezone and supports the 600 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 50131 ZIP Code Tabulation Area is approximately 28,600. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $67,131.