ZIP code 83121 is officially located in the state of Wyoming, primarily serving the city of Frontier. It falls under the administrative jurisdiction of Lincoln County. When planning mail delivery, logistics routing, or demographic research, 83121 operates within the Mountain Time (MT) timezone and supports the 557 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 83121 ZIP Code Tabulation Area is approximately 8,257. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $97,121.