6992 people
- Ober, Emily
- Ober, Francis Washington
- Ober, Henry
- Ober, Jane
- Ober, Margaret
- Ober, Robert
- Ober, Thomas
- Ober, William
- Oden, Betsey
- Offut, William M.
- Offutt
- Offutt, Thomas
- Offutt, Thomas, Jr.
- Offutt, Zadock
- Ogay, Jacob
- Ogden, Moses
- Ogden, Thomas
- Ogle, Benjamin
- Ogleton, Rezin
- Oliver, E. Washington
- Onion, John Barrett
- Ord, James
- Orm, John
- Orme, Jeremiah
- Orme, Jeremiah
- Orme, Rezin
- Orme, Thomas
- Orme, W. C.
- Orme, William C.
- Orsburn, Dennis
- Osborn, Elizabeth
- Osborn, Jane
- Ott, John
- Otterback, Philip
- Ould, Henry
- Ould, Robert
- Our, David
- Ourand, Elijah
- Over, David
- Over, Francis
- Over, Thomas
- Overton, Amey
- Overton, Daniel
- Overton, Joan
- Overton, Nelly
- Overton, Pompey
- Overton, Reazin
- Overton, Susan
- Owen, Bartholomew
- Owens, Benjamin
