ZIP code 81639 is officially located in the state of Colorado, primarily serving the city of Hayden. It falls under the administrative jurisdiction of Routt County. When planning mail delivery, logistics routing, or demographic research, 81639 operates within the Mountain Time (MT) timezone and supports the 401 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 81639 ZIP Code Tabulation Area is approximately 3,201. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $103,639.