ZIP code 59635 is officially located in the state of Montana, primarily serving the city of East helena. It falls under the administrative jurisdiction of Lewis and Clark County. When planning mail delivery, logistics routing, or demographic research, 59635 operates within the Mountain Time (MT) timezone and supports the 502 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 59635 ZIP Code Tabulation Area is approximately 41,102. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $135,635.