Prospect Grove, MissouriProspect Grove was an unincorporated community in Scotland County, in the U.S. state of Missouri. all that remained was the schoolhouse, named after the community.HistoryA post office called Prospect Grove was established by 1853, and remained in operation until 1904. The post office was a farm in 1876. The community was named for the grove in the prairie near the original town site.