Keymar is an unincorporated community in Carroll County, Maryland, United States.[1] The name of the community is a portmanteau of the family name Key (of which Francis Scott Key was a member) and Mar for Maryland. In 1822, Francis Scott Key sold his father's mansion and estate on Pipe Creek near this community. Keymar was likely the name of that estate.[2]
39°35′58″N 77°14′13″W / 39.59944°N 77.23694°W