Bellevue is a city in Erie, Huron, Seneca and Sandusky counties in the U.S. state of Ohio. The population was 8,193 at the 2000 census. The National Arbor Day Foundation has designated Bellevue as a Tree City USA. The Sandusky County portion of Bellevue is part of the Fremont Micropolitan Statistical Area, while the Huron County portion is part of the Norwalk Micropolitan Statistical Area. The small portions of the city that extend into Erie and Seneca counties are part of the Sandusky Metropolitan and Tiffin Micropolitan Statistical Areas, respectively. Bellevue was the home of Henry Morrison Flagler when he partnered up with John D. Rockefeller to start Standard Oil. Flagler later went on to build the Florida Overseas Railroad, to Key West, Florida. The property of his former Bellevue residence on Southwest Street is the current location of the Mad River & NKP Railroad Museum.