Watertown (city), New York  Watertown is a city in the U.S. state of New York and the county seat of Jefferson County. It is situated approximately south of the Thousand Islands, and along the Black River about east of its mouth at Lake Ontario. It lies northwest of Albany, the state capital, and northwest of New York City. As of the 2010 census, it had a population of 27,023, an increase of 1.2% since 2000. The U.S. Army post Fort Drum is near the city. Named after the many falls on the Black River, the city developed early in the 19th century as an industrial and manufacturing center. From years of generating industrial wealth, by the early 20th century the city was said to have more millionaires per capita than any other city in the nation. Geographically, Watertown is located in the central part of Jefferson County. It lies north of Syracuse and south of the Ontario border. The city is served by Watertown International Airport. The city claims to be the origin of the five and dime store and the safety pin, and it is the home of Little Trees air fresheners. It manufactured the first portable steam engine. It has the longest continually operating county fair in the United States. It holds the Red and Black football franchise, the oldest surviving semi-professional team in the United States. This was long part of the territory of the Iroquois Confederacy. In historic times, the Onondaga and the Mohawk had occupied this area. After the American Revolutionary War, they and other Iroquois nations were forced to cede most of their land to the United States under the terms of peace mediated by Great Britain. The US sold the land for development, mostly to migrants from New England. The city of Watertown was settled in 1800 by pioneers from New Hampshire, most notably Hart Massey, Henry Coffeen, and Zachariah Butterfield, part of a large migration into New York from New England after the Revolutionary War. These pioneers chose the area due to the Black River, which flowed west into Lake Ontario about five miles away. The pioneers' vision was for an industrial center that would draw power from the river. All the land was rough and forested. Elevation was also a problem. The western end of the town was higher than the eastern end, with a large depression in the middle. A small stream also passed through the town. Within a few years, settlers cleared the center of town to create the ambitious Public Square.