ZIP code 78657 is officially located in the state of Texas, primarily serving the city of Zcta 78657. It falls under the administrative jurisdiction of Llano County. When planning mail delivery, logistics routing, or demographic research, 78657 operates within the Central Time (CT) timezone and supports the 371 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 78657 ZIP Code Tabulation Area is approximately 15,771. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $109,657.