Wyoming County is a county located in the U.S. state of New York. At the 2010 census, the population was 42,155. The county seat is Warsaw. The name is from a modified Delaware Indian word meaning "broad bottom lands". Wyoming County was formed from Genesee County in 1841.
When counties were established in New York State in 1683, the present Wyoming 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, 1766, by the creation of Cumberland County, and further on March 16, 1770, by the creation of Gloucester County, both containing territory now in Vermont.
On March 12, 1772, what was left of Albany County was split into three parts, one remaining under the name Albany County. One of the other pieces, Tryon County, 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 Montgomery County in order 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.
Almost all of the land west of the Genesee River, including all of present day Wyoming County, was part of the Holland Land Purchase in 1793 and was sold through the Holland Land Company's office in Batavia, starting in 1801.
Genesee County was created by a splitting of Ontario County in 1802. This was much larger than the present Genesee County, however. It was reduced in size in 1806 by creating Allegany County; again in 1808 by creating Cattaraugus, Chautauqua, and Niagara Counties. Niagara County at that time also included the present Erie County.
Genesee County was further reduced in size in 1824 by creating Orleans County.
Finally, in 1841, Wyoming County was created from Genesee County.