Niagara Falls is a city in Niagara County, New York, United States. As of the 2000 census, the city had a total population of 55,593. It is across the Niagara River from Niagara Falls, Ontario, both named after the famed Niagara Falls which they share. It is part of the Buffalo-Niagara Falls Metropolitan area. Niagara Falls apartments for rent comparison page shows most up to date rent information on Niagara Falls apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.