Seneca County, New York: History
The area covered by Seneca County straddles the prehistoric territories of both Seneca and Cayuga Nations of the Haudenosaunee. 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 the fall of 1779 on orders from commander-in-chief General George Washington the Sullivan Expedition conducted a scorched earth campaign against the Iroquois who sided with the Loyalists in the Revolutionary War. Sullivan's path destroyed Cayuga and Seneca villages along the east shore of Seneca Lake.
In 1784, following the peace treaty that ended the American Revolutionary War, the name of Tryon County was changed to Montgomery County in honor of 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, Montgomery County was reduced in size by the splitting off of Ontario County. The actual area split off from Montgomery County was much larger than the present Ontario County, also including the present Allegany, Cattaraugus, Chautauqua, Erie, Genesee, Livingston, Monroe, Niagara, Orleans, Steuben, Wyoming, Yates, and parts of Schuyler and Wayne counties.
Herkimer County was one of three counties split off from Montgomery County (the others being Otsego and Tioga counties) in 1791.
Onondaga County was formed in 1794 by the splitting of Herkimer County.
Cayuga County was formed in 1799 by the splitting of Onondaga County. This county was, however, much larger than the present Cayuga County. It then included the present Seneca and Tompkins counties and part of Wayne County.
In 1804, Seneca County was formed by the splitting of Cayuga County.
In 1817, Seneca County was reduced in size by combining portions of Seneca and the remainder of Cayuga County to form Tompkins County. Part of this territory, the current towns of Covert and Lodi, were returned to Seneca County in 1819.
The original county seat of Seneca County was located in Ovid, where a court house was constructed in 1806. After southern portions of the county were removed in 1817 to become part of Tompkins County, the seat was moved to Waterloo as the village was more geographically centered at the time. In 1823, northern portions of the county were removed to form part of Wayne County. This put Waterloo in the same situation as Ovid with being on one end of Seneca County. A compromise was made to use both locations as county seats, becoming a two-shire county. …