ZIP code 40121 is officially located in the state of Kentucky, primarily serving the city of Fort knox. It falls under the administrative jurisdiction of Hardin County. When planning mail delivery, logistics routing, or demographic research, 40121 operates within the Central Time (CT) timezone and supports the 276 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 40121 ZIP Code Tabulation Area is approximately 6,576. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $97,121.