1. Ohio became a state on June 30, 1803. After being part of the Northwest Territory for 13 years, Ohio became the 17th state in the United States. The capital was established in Chillicothe until it was moved to Columbus in 1816.

2. The Ohio State University was established on June 30, 1870. Originally known as the Ohio Agricultural and Mechanical College, the school was created to promote education in agriculture and engineering. It has since grown to become one of the largest universities in the country.

3. The deadliest tornado in Ohio's history struck on June 30, 1908. The tornado, which started in Indiana and crossed over into Ohio, killed over 50 people and caused widespread damage in towns and cities along its path.

4. Cleveland Municipal Stadium, home of the Cleveland Indians and Cleveland Browns, opened on June 30, 1931. The stadium had a seating capacity of over 80,000 and was one of the largest stadiums in the world at the time. It was demolished in 1996 to make way for the current home of the Cleveland Browns, FirstEnergy Stadium.

5. The Ohio Turnpike, a 241-mile toll road that runs across northern Ohio, officially opened on June 30, 1955. The turnpike connects cities such as Cleveland, Toledo, and Youngstown and is a major transportation route for both commerce and tourism.