Carter is situated near the Missouri River at a site where a ferry operated for many years. The town was named in honor of Montana's first congressman, U.S. Senator Thomas Carter. The first post office was established in 1905 with Marie Worth as postmaster.
Today, this small community still features a ferry that crosses the Missouri River and provides access to the river at a Department of Fish, Wildlife and Parks site. It is located off US Highway 87.
Carter is located in northern Montana, between Great Falls and Fort Benton just off US Highway 87.