Tonawanda is a city in Erie County, New York, United States. The population was 15,129 at the 2020 census. It is at the northern edge …Tonawanda is a city in Erie County, New York, United States. The population was 15,129 at the 2020 census. It is at the northern edge of Erie County, south across the Erie Canal from North Tonawanda, east of Grand Island, and north of Buffalo. It is part of the Buffalo-Niagara Falls metropolitan area.
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