ZIP code 51537 is officially located in the state of Iowa, primarily serving the city of Harlan. It falls under the administrative jurisdiction of Shelby County. When planning mail delivery, logistics routing, or demographic research, 51537 operates within the Central Time (CT) timezone and supports the 327 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 51537 ZIP Code Tabulation Area is approximately 44,427. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $69,537.