| The Political Divisions of Delaware |
|---|
| County Name | Created | Origin | County Seat |
| Deale | 1680 | Deale County was created in 1680. In 1682 Deale County, Delaware, along with a section of Maryland's Eastern Shore called Durham County, was renamed Sussex County, Delaware. | Defunct, now known as Sussex County |
| New Castle | 1673 | Original County (Formally New Amstel) | Wilmington |
| Kent | 1682 | Created from Whorekill (Hoarkill) District. Formerly known as St. Jones County. Re-named in 1682 by William Penn for the English county of Kent | Dover |
| St. Jones | 1680 | Created from Whorekill (Hoarkill) District, established in 1664. | Defunct, now known as Kent County |
| Sussex | 1682 | In 1682 Deale County, Delaware, along with a section of Maryland's Eastern Shore called Durham County, was renamed Sussex County, Delaware. | Lewes until 1791, then Georgetown |
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