Olean is a city located in Cattaraugus County, New York, on the Allegheny River. It has a population of approximately 14, 000 people and is the largest city in the county. Ohio is a city located in Belmont County, Ohio, on the Allegheny River. It has a population of approximately 1, 500 people and is the county seat of Belmont County. Chautauqua is a city located in Chautauqua County, New York, on the Allegheny River. It has a population of approximately 4, 000 people and is the county seat of Chautauqua County. PAGE is a city located in Tyler County, West Virginia, on the Allegheny River. It has a population of approximately 500 people and is the county seat of Tyler County.