Kempster, WisconsinKempster is an unincorporated community located in Langlade County, Wisconsin, United States. Kempster is north of Antigo, in the town of Neva.HistoryA post office called Kempster was established in 1882, and remained in operation until it was discontinued in 2002. The community was named for Dr. Kempster, a member of staff at a psychiatric hospital.