O Cities in Ohio

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24 Ohio cities and towns start with O, from Oak Harbor to Oxford. The largest is Oxford, with an estimated 22,585 people in July 2024, per the US Census Bureau.

Oak Harbor Oak Hill Oakwood Oakwood Oakwood Oberlin Obetz Octa Ohio City Old Washington Olmsted Falls Ontario Orange Orangeville Oregon Orient Orrville Orwell Osgood Ostrander Ottawa Ottawa Hills Ottoville Otway Owensville Oxford