Mohegan Lake, or, rarely, Lake Mohegan, is a census-designated place located in the Town of Cortlandt and partially in the Town of Yorktown, both in Westchester County, New York. The change dates back to the early 1970s before which residents commonly referred to it as "Lake Mohegan", the name still used by the United States Census Bureau for the CDP.The population of Mohegan Lake in the 2010 Census was 6,010.