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| O Fither, Jacob | Stampers Creek Twp | 1840 | M704-89 | 44 |
| Oakds, Daniel | Northeast Twp | 1850 | M593-348 | 420 |
| Oblennis, Maria S. | Paoli Twp | 1860 | M653-286 | 734 |
| Ocbb, Sarah E. | Paoli Twp | 1860 | M653-286 | 727 |
| Ofethin, Jacob | | 1830 | M19-31 | 24 |
| Okes, David L. | Southeast Twp | 1860 | M653-286 | 577 |
| Oldham, Henry | Northeast Twp | 1850 | M593-348 | 416 |
| Oldham, Henry | Northeast Twp | 1860 | M653-286 | 701 |
| Oliver, Polly A. | French Lick Twp | 1860 | M653-286 | 801 |
| Oliver, William A. | French Lick Twp | 1860 | M653-286 | 801 |
| Orchard, Grinage | | 1830 | M19-31 | 48 |
| Oriley, Michale | French Lick Twp | 1850 | M593-348 | 474 |
| Ormsley, William | Orleans Twp | 1860 | M653-286 | 643 |
| Orrel, Eliza | Northeast Twp | 1850 | M593-348 | 414 |
| Orrel, Wade | Northeast Twp | 1850 | M593-348 | 413 |
| Orsburn, Abraham | | 1830 | M19-31 | 26 |
| Orsburn, David | | 1830 | M19-31 | 26 |
| Orsburn, Henry | | 1830 | M19-31 | 3 |
| Orsburn, Sarah | | 1830 | M19-31 | 27 |
| Ortan, Johnzey | | 1830 | M19-31 | 33 |
| Orten, John Z. | Paoli Twp | 1820 | M33-14 | 131 |
| Osborn, Abram R. | French Lick Twp | 1850 | M593-348 | 480 |
| Osborn, Adam | Northwest Twp | 1850 | M593-348 | 489 |
| Osborn, David | French Lick Twp | 1850 | M593-348 | 479 |
| Osborn, Jane | French Lick Twp | 1850 | M593-348 | 479 |
| Osborn, Jesse | French Lick Twp | 1850 | M593-348 | 479 |
| Osborn, Martha | French Lick Twp | 1850 | M593-348 | 479 |
| Osborn, Sarah | French Lick Twp | 1850 | M593-348 | 480 |
| Osborn, William | Paoli Twp | 1850 | M593-348 | 456 |
| Osborne, Abraham K. | French Lick Twp | 1860 | M653-286 | 815 |
| Osborne, Adam | Orangeville Twp | 1860 | M653-286 | 782 |
| Osborne, David | Orangeville Twp | 1860 | M653-286 | 769 |
| Osborne, Jesse | French Lick Twp | 1860 | M653-286 | 815 |
| Osborne, William | Paoli Twp | 1860 | M653-286 | 762 |
| Osburn, Abraham | Southeast Twp | 1820 | M33-14 | 127 |
| Osburn, Abraham | S West Twp | 1840 | M704-89 | 48 |
| Osburn, David | S West Twp | 1840 | M704-89 | 48 |
| Osburn, Enoch | Southeast Twp | 1820 | M33-14 | 127 |
| Osburn, Jesse | S West Twp | 1840 | M704-89 | 48 |
| Osburn, Jonathan | Paoli Twp | 1820 | M33-14 | 133 |
| Osburn, Margaret | Paoli Twp | 1820 | M33-14 | 136 |
| Osburn, Sarah | S West Twp | 1840 | M704-89 | 48 |
| Osmen, William | Paoli Twp | 1820 | M33-14 | 133 |
| Osobrn, Thomas | Paoli | 1850 | M593-348 | 463 |
| Overbey, Ephraim | | 1830 | M19-31 | 46 |
| Overby, David | Southeast Twp | 1850 | M593-348 | 375 |
| Overby, Ephriam | Southeast Twp | 1840 | M704-89 | 39 |
| Overby, John | Southeast Twp | 1840 | M704-89 | 39 |
| Overby, John | Southeast Twp | 1860 | M653-286 | 564 |
| Overby, Martin | Southeast Twp | 1840 | M704-89 | 39 |
| Overby, Sarah | Southeast Twp | 1860 | M653-286 | 578 |
| Overby, William | Stampers Creek Twp | 1840 | M704-89 | 44 |
| Overby, William | Southeast Twp | 1850 | M593-348 | 371 |
| Overlain, John | Southeast Twp | 1820 | M33-14 | 127 |
| Overlan, John H. | Jackson Twp | 1850 | M593-348 | 401 |
| Overlan, William J. | Jackson Twp | 1850 | M593-348 | 401 |
| Overlin, David R. | French Lick Twp | 1860 | M653-286 | 801 |
| Overlin, Eliza | French Lick Twp | 1860 | M653-286 | 802 |
| Overlin, John | | 1830 | M19-31 | 35 |
| Overlin, John | Jackson Twp | 1840 | M704-89 | 31 |
| Overlin, John H. | French Lick Twp | 1860 | M653-286 | 801 |
| Overlin, William | Jackson Twp | 1840 | M704-89 | 31 |
| Overman, James M. | Paoli Twp | 1860 | M653-286 | 764 |
| Overman, Thomas | | 1830 | M19-31 | 2 |
| Overman, William G. | Paoli Twp | 1860 | M653-286 | 764 |
| Owen, Alexander | Orangeville Twp | 1860 | M653-286 | 783 |
| Owen, Elisha L. | Northwest Twp | 1860 | M653-286 | 826 |
| Owen, Eliza J. | Northwest Twp | 1860 | M653-286 | 827 |
| Owen, Foutain | Orangeville Twp | 1860 | M653-286 | 786 |
| Owen, George W. | Orangeville Twp | 1860 | M653-286 | 775 |
| Owen, James | French Lick Twp | 1850 | M593-348 | 480 |
| Owen, John F. | Orangeville Twp | 1860 | M653-286 | 786 |
| Owen, Rachel J. | Orangeville Twp | 1860 | M653-286 | 770 |
| Owen, Thomas | Northwest Twp | 1850 | M593-348 | 484 |
| Owen, Thomas | Northwest Twp | 1860 | M653-286 | 826 |
| Owens, Andrew J. | Northwest Twp | 1860 | M653-286 | 820 |
| Owens, James | Orangeville Twp | 1860 | M653-286 | 775 |
| Owens, Thomas | Northwest Twp | 1840 | M704-89 | 54 |