North Bass Island is an island of the U.S. state of Ohio located in Lake Erie. A small unincorporated community, Isle Saint George, is on the island. The North Bass Island Post Office was established on May 25, 1864, and the name changed to Isle Saint George Post Office on March 2, 1874. The Isle Saint George ZIP code 43436 provides PO Box service. The island is equidistant to Port Clinton, OH and Kingsville, Ontario, Canada.

Middle Bass Island is an island of the U.S. state of Ohio, located in Lake Erie. A small town, Middle Bass, lies on the island. The 805-acre (3.258 km2) island is shaped like the Big Dipper and is one of three Bass Islands located at the center of a group of 23 smaller islands. It is located in Put-in-Bay Township, Ottawa County, Ohio.