Raccoon Island is an island in the Hingham Bay area of the Boston Harbor Islands National Recreation Area, situated just offshore of Hough's Neck in the city of Quincy. The island has a permanent size of just under 4 acres (16,000 m²), and is composed of bedrock outcroppings which reach an elevation of 30 feet (9.1 m) above sea level. The island is characterized by gravel beaches and rocky slopes.