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In 1990, the county population was 968,532 in a land area of 1,044 square miles, an average of 927 people per square mile.
The county seat is Buffalo, organized in 1810, incorporated as a village in 1816 and as a city in 1832.
The County itself was formed in 1821 from Niagara County which was itself formed in 1808 from Genesee County, formed in turn from Ontario County in 1802, which was created in 1789 from Montomery County which was formed in 1772 from Albany County (Montgomery was known as Tryon County until 1784).
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.
ErieCounty is in the extreme western portion of New York State, bordering on the lake of the same name.
The northern border of the county is Tonawanda Creek.