ZIP code 59931 is officially located in the state of Montana, primarily serving the city of Rollins. It falls under the administrative jurisdiction of Lake County. When planning mail delivery, logistics routing, or demographic research, 59931 operates within the Mountain Time (MT) timezone and supports the 742 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 59931 ZIP Code Tabulation Area is approximately 30,142. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $67,931.