ZIP code 51401 is officially located in the state of Iowa, primarily serving the city of Carroll. It falls under the administrative jurisdiction of Carroll County. When planning mail delivery, logistics routing, or demographic research, 51401 operates within the Central Time (CT) timezone and supports the 828 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 51401 ZIP Code Tabulation Area is approximately 23,228. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $57,401.