The Ohio Bicentennial was a series of events and programs held in the U.S. state of Ohio to coincide with the 200th anniversary of statehood on March 1, 2003. The Ohio Bicentennial Commission was established by the Ohio General Assembly in 1995 to sponsor commemorative barn paintings, bells, and historical markers throughout the state in the years leading up to the celebration.
Complementing the Commission's programs, the Ohio Historical Society restored the Adena Mansion, originally the home of Thomas Worthington, in 2003. In 2002, the U.S. Mint released 632,032,000 quarters commemorating Ohio's bicentennial as part of its 50 State Quarters program.
From 1997 to September 2002, the Committee commissioned Scott Hagan of Belmont County to paint a barn in each county with the committee's logo and colors. Nearly 2,000 barn owners volunteered their barns to be painted. In the end, Hagan painted 101 barns freehand, including one in each county. One was destroyed by a tornado shortly after its painting and was replaced. The barn painting program was conceived as a cost-effective way to advertise: each barn cost $1,500 to paint, about $500 less than the rent for a billboard. The painted barns celebrated the state's 200th anniversary in 2003. By 2013, many of the painted barns had faded or been repainted or torn down. Hagan went on to paint barn advertisements across the country.
The Commission also commissioned The Verdin Company of Cincinnati to cast a bronze bell on site, out in the open, in each county throughout the bicentennial year. Each 250-pound (110 kg) bell took two days to cast using a mobile foundry.
During the summer of 2003, a wagon train traveled across the state on the historic National Road from Martins Ferry to the Indiana state line at New Paris.