Kelleys Island is both a village in Erie County, Ohio, and the island which it fully occupies in Lake Erie. The island has a total area of 4.41 square miles (11.42 km2) and was formed by glacial action on limestone and dolomite.

As of the 2020 census it has a year-round population of under 300 and is primarily a vacation destination with a large seasonal influx of visitors and workers.

Kelleys Island was previously occupied by Native Americans of the area. During the beginning of the War of 1812, the island was used as a military rendezvous post, first by the British and later by the U.S. Military. The British originally called it Sandusky Island. Later the United States took it over and officially designated it as Island Number 6 and Cunningham Island. During the early 19th century, the island was mostly uninhabited. It was renamed as Kelleys Island in 1840 by brothers Datus and Irad Kelley, who had purchased nearly the entire island.

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