Schroon Lake is a hamlet and census-designated place in the town of Schroon in Essex County, New York, United States. The population was 833 at the 2010 census, or just over half of the total population of the town of Schroon.Schroon Lake CDP is located in the center of the town of Schroon, at the north end of Schroon Lake, the water body. U.S. Route 9 is the main road through the community, while Interstate 87 passes through the western part of the CDP. The CDP extends north along US 9 to Alder Meadow Road and south to Kates Way. The closest I-87 access is from Exit 28 north of the hamlet or Exit 27 to the south. US 9 leads north 8 miles to North Hudson and south the same distance to Pottersville, while I-87 leads north 70 miles to Plattsburgh and south 92 miles to Albany.According to the United States Census Bureau, the Schroon Lake CDP has a total area of 3.68 square miles, of which 2.89 square miles is land and 0.80 square miles, or 27.34%, is water.