Lockport is a city in, and the county seat of, Niagara County, New York, United States, surrounded by the town of Lockport.
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The population was 21,165 at the 2010 census, with an estimated population of 20,305 as of 2019. It is named from a set of Erie Canal locks (Lock Numbers 34 and 35) within the city. It is part of the Buffalo–Niagara Falls Metropolitan Statistical Area.