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is a Township in Sussex County, New Jersey, United States. As of the United States 2000 Census, the township population was 18,080. The township includes the communities of Ackerson, Edison, Hopewell, Houses Corner, Monroe, Sparta, Sparta Junction, Sussex Mills, Upper Mohawk, and Woodruffs Gap.
Sparta was organized as a township by an act of the New Jersey Legislature on April 14, 1845 from portions of Byram Township, Frankford Township, Hardyston Township and (the now-defunct) Newton Township. The township was named after the existing community of Sparta, which had been settled and named years before., the name likely coming from Sparta, Greece. Ogdensburg Borough was incorporated on February 26, 1914, when it separated from Sparta Township.
According to the United States Census Bureau, the township has a total area of 39.2 square miles (101.6 km²), of which, 37.4 square miles (96.8 km²) of it is land and 1.8 square miles (4.7 km²) of it (4.67%) is water.
Lake Mohawk is a census-designated place and unincorporated area located in parts of both Byram Township and Sparta Township.