- Oakley, Della L.
- Oakley, Samuel S., Sr.
- Oakley, Sam S., Jr.
- O'Banion, Child
- O'Banion, James Elbert
- Obitz, Beatrice
- Odle, Clarence E.
- Oldham, Agnes (Fly)
- Olive, Edward D.
- O'Neill, James Edward "Jim"
- O'Niel, Lucy Elizabeth (Baze)
- Orndorff, Johnny Junior
- Osborne, Infant
- Osborne, William J.
- Overton, Betty Jo (Dummitt)
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- Overton, Dorothy Jean (Rowe)
- Overton, Edgar
- Overton, Eliza (Swindle)
- Overton, Ernest
- Overton, John Paul
- Overton, Oscar S., Dr.
- Owens, Edna J. (Letts)
- Owens, Iolene Joyce (Coatney) (Lombard)
- Owings, Fannie Pauline
- Owings, George H.
- Owings, John Carl
- Owings, Lavonne Dollie (Wilson)
- Ozbun, Sarah Fairie (Reagon)
- Ozburn, Marshall John
- Ozburn, Ralph
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