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- O’Brien, John
- O’Connell, Mary
- O’Connell, William R.
- O’Conner, Bridget
- O’Connor, John
- O’Donnell, James K.
- O’Neill, James_
- Oake, Georget R.
- Oameg, Christopher
- Oathout, John
- Obrien, Mary
- Officer, Elizabeth M.
- Officer, John Scott
- Officer, Robert
- Officer, William P.
- Ohlendorf, E. N.
- Ohlendorf, Julia C.
- Olcott, George
- Oldham, Olive G.
- Olds, Luella L.
- Oliver, John T.
- Oliver, Wm. G.
- Olsen, E. P.
- Olsen, Hans
- Olsen, John
- Olsen, Niels
- Olsen, Paul
- Olsen, Peter
- Olson, Christian Peter
- Olson, Hulda K.
- Olson, Neils
- Oltman, John M.
- Oltmans, Adolph
- Orr, William
- Orsler, Orman
- Osborne, Major
- Osgood, Marshall
- Otte, Christian
- Otto, James & Mehitabel
- Ouren, Francis W.
- Ouren, Hogan
- Overton, Americus
- Overton, Cortes F
- Owen, Alexander Owen, Wm.
