Long Lake is a town in Hamilton County, New York, in the United States. The population was 711 at the 2010 census.The town is named for 14-mile-long Long Lake, beside which it sits. The town is entirely within the Adirondack Park and is the most northerly town in the county. It is a summer tourism destination offering fishing, hiking, boating, and many other outdoor activities. In the winter months, snowmobiling is also popular. Long Lake is the home of the historic Adirondack Hotel.