Jefferson is a town in Lincoln County, Maine, United States. According to the United States Census Bureau, the town has a total area of 58.6 square miles (152 sq.km), of which, 52.7 square miles (136 sq.km) of it is land and 6.0 square miles (16 sq.km) of it (10.16%) is water. Jefferson is located on the Great Bay of Damariscotta Lake. Damariscotta Lake State Park is a 17-acre (69,000 m2) State Park located in Jefferson. Abandoned granite quarries and clay banks where bricks were made suggest the early economic activities of the area.