History of South America

Which state in the union has a flag that is not rectangular shape?

The state of Ohio has a flag that is not rectangular in shape. The flag of Ohio is a swallow-tailed burgee, which is a triangular flag with a swallow-like tail. The flag is red, with a white circle in the center. The circle is surrounded by seventeen white five-pointed stars, representing the state's seventeen counties when it was admitted to the Union in 1803.