Mountain Lake's
Daily Encourager

Mountain Lake is an unincorporated community and census-designated place (CDP) located within Liberty Township in Warren County, in the U.S. state of New Jersey, that was created as part of the 2010 United States census. As of the 2020 United States census, the CDP's population was 494 a decrease of 81 (−14.1%) from the 575 recorded at the 2010 census.