Sucia Island is located 2.5 miles (4.0 km) north of Orcas Island, in the San Juan Islands, San Juan County, Washington, United States. It is the largest of an archipelago of ten islands including Sucia Island, Little Sucia, Ewing, Justice, Herndon, the Cluster Islands islets, and several smaller, unnamed islands. The group of islands is about 2.5 miles (4.0 km) in length and just under half a mile wide. Sucia island is roughly shaped like a hand.The total land area of all the islands is 2.74 km², while the main island, Sucia Island, alone measures 2.259 km². According to the 2000 census, there was a permanent population of four people, all residing on Sucia Island. Sucia Island State Park is a part of Washington State Marine Park.