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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