Lord Baltimore, the Proprietor of Maryland, claimed all present-day Delaware, and organized its northern and eastern portions as Durham County, Maryland. However, this county existed only on paper. The southern and western portions of present-day Sussex County were organized as portions of several adjacent Maryland counties and were not recognized as part of Delaware until the Mason-Dixon Survey was run in 1767. In 1791, with the expansion of Sussex County to the south and west, the county seat was moved to Georgetown. The county seat of St. Jones (renamed Kent County in 1681) is at Dover.
Lord Baltimore, the Proprietor of Maryland claimed all present-day Delaware, and organized its northern and eastern portions as Durham County, Maryland. However, this county existed only on paper. The southern and western portions of present-day Sussex County were organized as portions of several adjacent Maryland counties and were not recognized as part of Delaware until the Mason-Dixon Survey was run in 1767. In 1791, with the expansion of Sussex County to the south and west, the county seat was moved to Georgetown. The county seat of St Jones (renamed Kent County in 1681) is at Dover.