Genesee County -
1802
All of Western New York
included four towns
Batavia
Northampton
Southampton
Leicester
Genesee County -
1806
Allegany taken from Genesee
Genesee County -
1808
Niagara, Chautauqua, and Cattaraugus formed
Genesee County -
1821
Erie, Monroe, and Livingston formed
Genesee County -
1824
Orleans County formed
Genesee County -
1841
Wyoming County formed
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