Waterloo is a village in and the county seat of Seneca County, New York, United States. The population was 5,111 at the 2000 census. The village is named after the Waterloo in Belgium, where Napoleon was defeated. The current Town Supervisor is James Mooney and the current Town Clerk is Louise Van Nostrand
The Village of Waterloo is mostly in the Town of Waterloo, but the part south of the Cayuga-Seneca Canal of the village is in the Town of Fayette and a small portion in the south-east corner of the village is in the Town of Seneca Falls. Waterloo is east of Geneva and is located in between the two main Finger Lakes, Seneca Lake and Cayuga Lake.
The area was within the realm of the Cayuga nation, one of several bands to form the Iroquois League. They were visited by Jesuit missionaries in the 17th Century. After the Sullivan Expedition of 1779 passed through the region, many natives left the area. The land then became part of the Central New York Military Tract, reserved for veterans. The current site of the village was the location of the former Cayuga village "Skoiyase" ("flowing water"). The first new settler, Jabez Gorham, arrived on the site of the village around 1795. The early village was known as "New Hudson".