Champlain is a town in Clinton County, New York, United States. The population was 5,754 at the 2010 census. The town is located on the west shore of Lake Champlain, near the north end of the lake.The town occupies the northeast corner of Clinton County and the state of New York. Within the town are two villages, one of which is also named Champlain. The other is the village of Rouses Point.