ZIP code 59859 is officially located in the state of Montana, primarily serving the city of Plains. It falls under the administrative jurisdiction of Sanders County. When planning mail delivery, logistics routing, or demographic research, 59859 operates within the Mountain Time (MT) timezone and supports the 335 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 59859 ZIP Code Tabulation Area is approximately 3,135. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $43,859.