Casco is a town in Cumberland County, Maine, United States. The population was 3,742 at the 2010 census. Casco includes the villages of Casco, South Casco and Cook Mills. The town borders the east shore of Sebago Lake, and is home to part of Sebago Lake State Park. Casco is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. Casco is just under 30 miles (48 km) from downtown Portland.
Casco is the home of "Casco Days", an annual community fair which takes place in Casco Days Park, always on the last Saturday in July.
On January 30, 1767, Raymondtown Plantation was granted by the Massachusetts General Court to Capt. William Raymond of Beverly, Massachusetts and his company of soldiers for their service with Sir William Phipps in the 1690 Battle of Quebec. It replaced a 1735 grant called Beverly-Canada (now Weare, New Hampshire) which was ruled invalid in 1741 because of a prior claim by the heirs of John Mason. In 1803, Raymondtown Plantation was incorporated as Raymond.