Ohio was a state in United States.
During the 2012 apocalypse, Ohio was hit by massive earthquakes which caused major damage to the cities and towns, killing numerous people inhabiting the state. The Yellowstone Ash Cloud engulfed the remains of Ohio when it spread around the U.S and Canada. When the Worldwide Flooding occured, Ohio was then swept by one of the gigantic tsunamis and is submerged underwater, killing the remaining population that weren't picked up.
As a result of the apocalypse, Ohio is left uninhabitable from the earthquakes, volcanic eruptions and tsunamis, leaving it with extreme damage.