City (pop., 2000: 18,816), northeastern New York, U.S. Situated on the western shore of Lake Champlain , south of the Canadian border, Plattsburgh was founded by Zephaniah Platt in 1784.
It was the scene of an important U.S. victory during the War of 1812 on Lake Champlain that saved New York from British invasion via the Hudson River valley. Incorporated as a city in 1902, it became the centre of the Lake Champlain resort area.