Newport County's own Aquidneck Island, home to the towns of Middletown and Portsmouth, and the city of Newport, originally was known as the Native American name, Pocasset. Though it is the largest island in Narragansett Bay, there are many other islands in and about Newport, Rhode Island: √ Conanicut Island - the second largest island in Narragansett Bay and home to Newport County's Jamestown. It was once the site of the royal residence of 17th century Chief Conanicus of the Narragansett Indians. The largest Native American (1 comments)