Ohio's Flag History
Unique among the state flags of the union, the Ohio State Flag was designed by John Eisemann. Described as a pennant, the Ohio burgee is properly a swallowtail design. It was adopted in 1902.
The Ohio flag, unique in shape but uncomplicated in design, is filled with symbolism. The union of the flag, a large blue triangle is populated with seventeen white stars. Those that are grouped around the circle represent the thirteen original colonies. The four stars found at the apex of the triangle combine with the stars of the thirteen original colonies to total seventeen. Ohio was the seventeenth state to enter the union.
Three red and two white horizontal stripes and the blue field copy the red, white and blue of the Stars and Stripes. The blue field represents Ohio's hills and valleys. The stripes represent the roads and waterways of the state.
The white circle with a its red center forms the "O" in Ohio and can also be related to the state's nickname, the "Buckeye State".
The flag of the state shall be pennant shaped. It shall have three red and two white horizontal stripes. The union of the flag shall be seventeen five-pointed stars, white in a blue triangular field, the base of which shall be the staff end or vertical edge of the flag, and the apex of which shall be the center of the middle red stripe. The stars shall be grouped around a red disc superimposed upon a white circular "O". The proportional dimensions of the flag and of its various parts shall be according to the official design on file in the office of the secretary of state. One state flag of uniform dimensions shall be furnished to each company of the organized militia.
Link here to the Ohio State Historical Society for facts, figures and history of Ohio.