In 1796, Ontario County was
divided and Steuben County was organized. In
1802, Ontario County was reduced when Genesee
County was split off. The new county was
originally very large, including the
present Allegany, Cattaraugus, Chautauqua, Erie, Niagara, Orleans and Wyoming
Counties and parts
of Livingston and Monroe counties.
In 1821, portions of Genesee
County were combined with portions of Ontario
County to create Livingston and Monroe counties.
In 1823, a portion of Seneca
County was combined with a portion of Ontario
County to create Wayne County. The same year, a
portion of Steuben County was combined with a
portion of Ontario County to create Yates
County.
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