ZIP code 83428 is officially located in the state of Idaho, primarily serving the city of Irwin. It falls under the administrative jurisdiction of Bonneville County. When planning mail delivery, logistics routing, or demographic research, 83428 operates within the Mountain Time (MT) timezone and supports the 701 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 83428 ZIP Code Tabulation Area is approximately 39,901. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $116,428.