ZIP code 51545 is officially located in the state of Iowa, primarily serving the city of Little sioux. It falls under the administrative jurisdiction of Harrison County. When planning mail delivery, logistics routing, or demographic research, 51545 operates within the Central Time (CT) timezone and supports the 424 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 51545 ZIP Code Tabulation Area is approximately 35,424. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $105,545.