Chronology of Ontario County, New York

 

 1/27/1789  Creation of Ontario County - all land west of Pre-emption Line  
 3/13/1796  Steuben County taken from Ontario County  
 3/30/1802  Genesee County taken from Ontario County  
 4/7/1806  Allegany County taken from Genesee County  
 3/11/1808  Cattaraugus County taken from Genesee County  
 3/11/1808  Niagara County taken from Genesee County  
 3/11/1808  Chautauqua County taken from Genesee County  
 2/23/1821  Livingston County taken from Genesee Co. AND  Ontario County
 2/23/1821  Monroe County taken from Livingston Co. AND  Ontario County
 4/2/1821  Erie County taken from Niagara County  
 2/5/1823  Yates County taken from Ontario County  
 4/11/1823  Wayne County taken from Ontario Co. AND  Seneca County
 11/12/1824  Orleans County taken from Genesee County  
 5/14/1841  Wyoming County taken from Genesee County  
 4/17/1854  Schuyler County taken from Ontario Co. AND  Steuben, Tompkins

Creation of Towns on Ontario County

 11/2/1796  Bristol
 November 1790  Canandaigua
 June 1795  Bloomfield; amended June 1798
 November 1796  Farmington
 November 1796  Gorham (original names Easton, Lincoln)
 November 1795  Naples (original name Middletown)
 November 1795  Phelps (erected as Sullivan)
 1/27/1789  Richmond (original name Pittstown)
 November 1792  Seneca
 5/26/1812  Victor taken from Bloomfield
 3/31/1821  Manchester (original name Burt) taken from Farmington
 3/29/1822  Hopewell taken from Gorham
 4/15/1829  Canadice taken from Richmond
 2/11/1833  West Bloomfield taken from Bloomfield
 3/8/1838  South Bristol taken from Bristol
 11/15/1872  Geneva taken from Seneca

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