 Much of the community was originally an estate, Colebrook, purchased in 1671 by Thomas Dent and William Hatton, and then in 1688 by Colonel John Addison.Colebrook Manor, the family homestead of the Addisons, was built in 1808, located in Oxon Run Valley, 2/5 of a mile southeast of the Washington, D.C. line.Prince George's County Police Department District 4 Station in Glassmanor CDP, with an Oxon Hill postal address, serves the community.