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When counties were established in New York State in 1683, the present Ontario County was part of Albany County. This was an enormous county, including the northern part of New York State as well as all of the present State of Vermont and, in theory, extending westward to the Pacific Ocean. This county was reduced in size on July 3, 1766Events January 1 Bonnie Prince Charlie becomes the new Stuart claimant to the throne of Great Britain as King Charles III and figurehead for Jacobitism. March 5 Antonio de Ulloa, the first Spanish governor of Louisiana, arrives in New Orleans. March 18 Am by the creation of Cumberland CountyCumberland County, New York was a former county in the Province of New York that became part of the state of Vermont. It was divided out of Albany County in New York in 1766, but eventually became part of Vermont in 1777. At that time, Vermont was holding, and further on March 16March 16 is the 75th day of the year in the Gregorian Calendar (76th in Leap years). There are 290 days remaining. Events 1190 Crusaders start to massacre the Jews of York, England. 1521 Ferdinand Magellan reaches the Philippines. 1621 Samoset, a Mohegan,, 1770Events March 5 Boston Massacre: 5 Americans killed by British troops in an event that would help start the American Revolutionary War 5 years later. May 14 Marie Antoinette arrives to French Court. May 16 14-year old Marie Antoinette marries 15-year old L by the creation of Gloucester CountyGloucester County, New York is a former county in New York that became part of the state of Vermont. It was a part of Albany County in the Province of New York until 1770 and was lost to Vermont in 1777. At that time, Vermont was holding itself out as the, both containing territory now in Vermont.
On March 12March 12 is the 71st day of the year in the Gregorian Calendar (72nd in Leap years). There are 294 days remaining. Events 515 BC Construction is completed on the Temple in Jerusalem. 1664 New Jersey becomes a colony of Britain. 1894 For the first time Coc, 1772Events February 17 First partition of Poland, by Russia and Prussia, later including Austria May Watauga Association formed in East Tennessee as the first independent Anglo-American government. June 9 British vessel Gaspee is burned off of Rhode Island., what was left of Albany County was split into three parts, one remaining under the name Albany County. One of the other pieces, Tryon CountyTryon County, New York is a former county in New York, part of the Province of New York, named after Governor William Tryon. In 1784 the county was renamed as Montgomery County, New York after General Richard Montgomery. Tryon County was created in 1772 f, contained the western portion (and thus, since no western boundary was specified, theoretically still extended west to the Pacific). The eastern boundary of Tryon County was approximately five miles west of the present city of Schenectady, and the county included the western part of the Adirondack Mountains and the area west of the West Branch of the Delaware River. The area then designated as Tryon County now includes 37 counties of New York State. The county was named for William Tryon, colonial governor of New York.
In the years prior to 1776, most of the Loyalists in Tryon County fled to Canada. In 1784, following the peace treaty that ended the American Revolutionary War, the name of Tryon County was changed to honor the general, Richard Montgomery, who had captured several places in Canada and died attempting to capture the city of Quebec, replacing the name of the hated British governor.
In 1789, Ontario County was split off from Montgomery. The actual area split off from Montgomery County was much larger than the present county, also including the present Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston, Monroe, Niagara, Orleans, Steuben, Wyoming, and Yates Counties, and part of Schuyler and Wayne Counties.
In 1796, Ontario County was reduced in size by the splitting off of Steuben County.
In 1802, Ontario County was reduced in size by the splitting off of Genesee County. The actual area split off from Ontario County was much larger than the present county, also 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.