Cleveland is a city of Ohio, a state of the United States of America.
Cleveland was the home of the baseball team known as the Cleveland Indians. (TNG: "The Big Goodbye")
In another simulation of Dixon Hill, Guinan claimed to be Hill's cousin Gloria, and indicated that she was from Cleveland. (TNG: "Clues")
In 1947, Nog claimed that his race was going to invade Cleveland to his captors at Roswell. (DS9: "Little Green Men")
Cleveland is also near the site of Kent State University. Captain Janeway and Lt. B'Elanna Torres consulted a study regarding antimatter from Kent State. (VOY: "Deadlock")