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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 |