Garneill, MontanaGarneill is an unincorporated community in Fergus County, Montana, United States. It is located on U.S. Route 191, north of Judith Gap.HistoryA post office was established at Garneill in 1899, and remained in operation until it was discontinued in 1975. Garneill is a conjoin of the names of two early settlers: Garnet and Neill.