Kent County	001	Dover	1680	Created from Whorekill (Hoarkill) District. Formerly known as St. Jones County.	named in 1682 by William Penn for the English county of Kent	162,310	800 sq mi
(2,072 km2)	State map highlighting Kent County
New Castle County	003	Wilmington	1664	Original County (Formally New Amstel)	named in 1673 by Dutch Governor Anthony Colve for the town of New Castle, Delaware as an Anglicization of Nieuw Amstel.	538,479	494 sq mi
(1,279 km2)	State map highlighting New Castle County
Sussex County	005	Georgetown	1664	Created from Whorekill (Hoarkill) District. Formerly known as Deale County	named in 1682 by William Penn for the English county of Sussex, which was his home county	197,145	1,196 sq mi
(3,098 km2)	State map highlighting Sussex County