· Ohio · Oklahoma · Oregon
· There are no cities in Maryland that begin with the letter O. However, Ocean City is a town in Worcester County, Maryland
On and Of
One country starts with the letter "O", Oman
U.S. state capitals that start with the letter O:Oklahoma City, OklahomaOlympia, Washington
Two counties in South Carolina begin with the letter O. Oconee and Orangeburg are counties in South Carolina.
· Okra · Olives · Orange
Oboe and olives are objects. Oranges and ostrich begin with the letter o.
Outstanding and optimistic are positive words. They begin with the letter o.
Oregon, which lies between Washington State to the North, and California and Nevada to the South. There are only two other States that begin with the letter 'O', these being Ohio and Oklahoma.
Oceanography and optometry are college subjects. They begin with the letter o.
Oranges, olives and okra are fruits. They begin with the letter o.