ZIP code 51565 is officially located in the state of Iowa, primarily serving the city of Portsmouth. It falls under the administrative jurisdiction of Shelby County. When planning mail delivery, logistics routing, or demographic research, 51565 operates within the Central Time (CT) timezone and supports the 470 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 51565 ZIP Code Tabulation Area is approximately 17,270. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $45,565.