ZIP code 37138 is officially located in the state of Tennessee, primarily serving the city of Old hickory. It falls under the administrative jurisdiction of Davidson County. When planning mail delivery, logistics routing, or demographic research, 37138 operates within the Central Time (CT) timezone and supports the 567 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 37138 ZIP Code Tabulation Area is approximately 35,567. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $86,138.