Lake Mohawk is an unincorporated residential development and census-designated place (CDP) split between Byram Township and Sparta Township, in Sussex County, in the U.S. state of New Jersey. As of the 2010 United States census, the CDP's population was 9,916, of which 1,824 were in Byram Township and 8,092 in Sparta Township.

Byram Township is a township in Sussex County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 8,028, a decrease of 322 (−3.9%) from the 2010 census count of 8,350, which in turn reflected an increase of 96 (+1.2%) from the 8,254 counted in the 2000 census.