In 1790 all of Western New York was part of Ontario County with its seat in Canandaigua. By 1802, efforts by Joseph Ellicott brought about the separation of western Ontario County into Genesee County, with its seat at the Holland Land Company headquarters in Batavia. Genesee County was later split into five counties--Genesee, Allegany (1806), Chautauqua (1806), Cattaraugus (1808), and Niagara (1808). Niagara County had its seat at the Village of Buffalo until it was split in two in 1821 to create in the southern section the new Erie County with its seat in Buffalo. Three years previous to the division, the Town of Amherst was established, and in 1821, it constituted part of the northern fringe of new Erie County, bordering across Tonawanda Creek on Niagara County. The dotted part of Niagara County became Erie County.
From the North Tonawanda History Museum Collection