Marblehead is a village in Ottawa County, Ohio, United States. The population was 903 at the 2010 census.It sits at the tip of the Marblehead Peninsula, which divides Lake Erie proper from Sandusky Bay. In the summer, it is a popular vacation area because of its lake frontage, ferry service to the Lake Erie Islands, quality sport fishery, the nearby Chautauqua at Lakeside, and the Cedar Point amusement park.Marblehead is also commercially important as a major limestone producer.