| The Political Divisions of Connecticut |
|---|
| COUNTY | DATE ESTABLISHED | PARENT COUNTY |
| Fairfield County | May 10, 1666 | Oringinal County |
| Hartford County | May 10, 1666 | Original County |
| Litchfield County | October 9, 1751 | From portions of Fairfield, New Haven, & Hartford counties. |
| Middlesex County | May, 1785 | From portions of Hartford & New London Counties |
| New Haven County | May 10, 1666 | Original County |
| New London County | May 10, 1666 | Original County |
| Tolland County | October 13, 1785 | From portions of eastern Hartford & western Windham Counties. |
| Windham County | May 12, 1726 | From portions of Hartford & New London counties |
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