Metropolis is a city located along the Ohio River in Massac County, Illinois, in the United States. As of the 2000 census, the city population was 6,482. It is the county seat of Massac County. Metropolis is part of the Paducah, KY-IL Micropolitan Statistical Area. Prior to the American Civil War there was a proposal to establish a Western District of Columbia to include present day Metropolis and the nearby area of Kentucky. An 1850 map illustrates this proposal. On January 21, 1972 DC Comics declared Metropolis "Hometown of Superman". On June 9, 1972 the Illinois State Legislature passed Resolution 572 that declared Metropolis the "Hometown of Superman," the comic book superhero who is based in the fictional city of Metropolis. Among the ways it celebrates the character are a large Superman statue in the city, a small Superman museum, and an annual Superman Celebration that is always held the second weekend in June. Also, it has a local newspaper, known as The Metropolis Planet, a name inspired by the newspaper in fictional Metropolis, The Daily Planet. Metropolis is also home to Harrah's Metropolis casino/hotel, a riverboat casino frequented by visitors from around the region, making tourism one of the city's largest industries.