Glens Falls is a city in Warren County, New York, United States and is the central city of the Glens Falls Metropolitan Statistical Area. The population was 14,700 at the 2010 census. The name was given by Colonel Johannes Glen, the falls referring to a large waterfall in the Hudson River at the southern end of the city.Glens Falls is a city located in the southeast corner of Warren County, surrounded by the town of Queensbury to the north, east, and west, and by the Hudson River and Saratoga County to the south. Glens Falls is known as "Hometown U.S.A.", a title given to it by Look Magazine in 1944. The city has also referred to itself in the past as the "Empire City.