Brusett lies in the vast prairie surrounding Long Tree Creek and established itself in Montana in the early 1900s. At first, the settlement had no official name, and homesteaders simply referred to themselves as Long Tree Creek settlers.
Under this circumstance, homesteaders had to travel to other nearby communities for most of their shopping and postal needs. Resident Mrs. Glen Smith, however, believed the settlers deserved more. In 1916, Mrs. Smith applied to Washington for a post office to be established near Long Tree Creek. When her request was approved, Mrs. Smith chose her maiden name, Brusett, as the official town name. Brusett quickly began serving the needs of neighboring communities, and at one time, Brusett handled the mail for more than 136 families scattered across the countryside.