Somerset County, MD

History

Somerset County was created in 1666 by an Order in Council. In 1742 Worcester County was created from Somerset County. In 1867 portions of Somerset and Worcester Counties were taken to create Wicomico County.
http://en.wikipedia.org/wiki/Somerset_County,_Maryland

Modern Day Adjacent Counties

Accomack County, Virginia (south)
Wicomico County, MD (north)
Worcester County, MD (east)

Gleanings from