ZIP code 78721 is officially located in the state of Texas, primarily serving the city of Austin. It falls under the administrative jurisdiction of Travis County. When planning mail delivery, logistics routing, or demographic research, 78721 operates within the Central Time (CT) timezone and supports the 379 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 78721 ZIP Code Tabulation Area is approximately 17,879. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $97,721.