ZIP code 16638 is officially located in the state of Pennsylvania, primarily serving the city of Entriken. It falls under the administrative jurisdiction of Huntingdon County. When planning mail delivery, logistics routing, or demographic research, 16638 operates within the Eastern Time (ET) timezone and supports the 461 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 16638 ZIP Code Tabulation Area is approximately 3,961. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $86,638.