| Film | Name | No. | Names and Extra Information | |
| 55 | O'Banks, Aaron | 1 | Vs. Betsy O'Banks | |
| 168 | O'Brain, John Nelson | 34 | D. 17 Nov 1905 | |
| 57 | O'Brecht, Jacob & Mary | 15 | Jacob O'Brecht Jr.- Guardian | |
| 59 | O'Brien, John | 32 | Vs. State of Indiana | |
| 14 | O'Brien, Murrough | 87 | Vs. Christopher J. Gillett | |
| 227 | O'Bright, Mary | 72 | Widower - Jacob O'Bright - Eva T. Shoup - daughter | |
| 228 | O'Connor, Edward | 70 | Vs. O'Connor, Josephine | |
| 228 | O'Connor, Josephine | 69 | Vs. O'Connor, Edward | |
| 25 | O'Dell, Thomas | 123 | Slater, Henry | |
| 146 | O'Hara no first name | 18 | Throupe, Clara | |
| 98 | O'Harran, John | 80 | Vs. State of Indiana | |
| 216 | O'Neal, Erastus | 32 | Vs. State of Indiana | |
| 32 | O'Neal, Thomas | 44 | James and Mary - MH. | |
| 67 | O'Neal, Thomas | 24 | Ira Jackson - Adm. | |
| 161 | O'Neil, Margaret | 40 | Packet cover only - Refilmed Documents | |
| 161 | O'Neil, Margaret | 95 | D. 17 Feb 1905 - Widower - John O'Neal - Five daughters | |
| 116 | O'Reilly, Thomas F. | 18 | Anne & Elizabeth O'Reilly | |
| 228 | Oakes, Elmer | 54 | Vs. Leader, Frank - Sheriff | |
| 41 | Oakes, John | 21 | Estate | |
| 65 | Oakley, Harriet | 204 | Vs. Crane, William | |
| 221 | Oakley, James | 116 | Vs. Clausen, Charles - Continued on Film 222 | |
| 222 | Oakley, James | 2 | Vs. Clausen, Charles - Continued from Film 221 | |
| 62 | Oaks, Cynthia A. | 61 | Vs. Calleyham, Sarah & others | |
| 132 | Oaks, Earl | 4 | Vs. State of Indiana | |
| 60 | Oaks, Henry | 193 | Vs. Dodge, Henry | |
| 119 | Oaks, Isaac | 6 | D. 25 Sep. 1891 | |
| 8 | Oaks, John | 34 | Mary Crain - MH. | |
| 31 | Oaks, John W. | 44 | Sarah MH. - Cynthia widow & Guard. | |
| 51 | Oaty, James | 130 | Vs. Soyreign, David | |
| 204 | Obergiel, Solomon | 43 | Michael Meister - Admr. | |
| 10 | Oberley, Hiram | 62 | Mary, Martin & Hellen | |
| 15 | Oberly, Anna | 198 | Estate | |
| 8 | Oberly, Margaret | 18 | Utopia and Maggaret Oberly - MH. | |
| 15 | Oblinger, H.G. | 81 | Vs. Manassah Bear | |
| 103 | Obrecht, Jacob | 48 | Vs. Walters, George | |
| 100 | Obricht, Rosa | 30 | Vs. City of Goshen | |
| 31 | Ockmoody, Lydia | 52 | Lydia Fisher - MH. | |
| 17 | Odren, Ezadore H. | 7 | Estella Odren - Widow | |
| 249 | Oesch, William W. | 122 | Vs. Ebi, Daniel | |
| 51 | Ogden, David | 172 | Vs. Vesey, William | |
| 25 | Ogden, Denus A. | 224 | Vs. State of Indiana | |
| 148 | Ogle, Charles A. | 12 | Howard & Martha Ogle | |
| 99 | Ogle, Jacob | 135 | Vs. State of Indiana | |
| 188 | Ogle, Jacob | 67 | David, Minnie, Anna, William, Lottie & Herman | |
| 253 | Ogle, Ray | 78 | Vs. Pierce, Laura & Rookstool, Mary | |
| 61 | Ogle, William | 195 | Vs. State of Indiana | |
| 14 | Oglesbee, Nathan N. | 35 | Vs. Jacob Berkey | |
| 64 | Oilinehouse, Jonathan | 6 | Vs. Alford, Royal, Joseph | |
| 101 | Olds, Samuel | 34 | Charles Olds - Admr. | |
| 174 | Olinghouse, Rusell | 21 | Vs. Mc Dowell, Guy | |
| 99 | Oliver, Robert J. | 15 | Vs. Deuring, William | |
| 210 | Olsan, Ellen | 72 | Vs. State of Indiana | |
| 245 | Olson, Alfred | 41 | Vs. State of Indiana | |
| 235 | Olson, Andrew | 58 | Vs. Gent, John | |
| 214 | Olson, P.A. | 60 | Vs. State of Indiana | |
| 304 | Onderkirk, James | 25 | Vs. Onderkirk, Louisa | |
| 304 | Onderkirk, Louisa | 26 | Vs. Onderkirk, James | |
| 56 | Onit, William & Eli | 55 | Vs. Banta, May | |
| 140 | Oppenheim, Joseph G. | 32 | Harris Oppenheim - son | |
| 98 | Oppenheimer, Lee | 66 | Vs. State of Indiana | |
| 99 | Oppenheimer, Willis | 163 | Vs. State of Indiana | |
| 178 | Opperman, Amelia Kemp | 51 | Lottie Opperman - MH. | |
| 163 | Opperman, Charles | 40 | D. 3 Nov 1903 - Widow - Susannah Opperman | |
| 178 | Opperman, Charles | 31 | Maud Opperman - MH. - Effie Operman - Guardian | |
| 181 | Opperman, Louis | 65 | Vs. Cripe, Samuel | |
| 161 | Opperman, Susannah | 34 | Packet cover only - Refilmed Documents | |
| 161 | Opperman, Susannah | 88 | Adam Cripe - Admr. | |
| 2 | Oram, Thomas | 12 | William and Mary of England | |
| 44 | Orchard, Mary | 66 | Naomi, Philip, Louiza and Mary - MH. | |
| 227 | Orcutt, Harry | 69 | Vs. State of Indiana | |
| 8 | Ormsby, Hiram | 66 | Papers Missing | |
| 9 | Ormsby, Hiram | 22 | Minor Heirs | |
| 9 | Ormsby, Hiram | 54 | Estate | |
| 13 | Ormsby, Hiram | 48 | Mary Ormsby - MH. | |
| 71 | Orndorff, Henry | 3 | Henry Myers - Adm. | |
| 253 | Orosz, Joe | 19 | Vs. State of Indiana | |
| 203 | Orr, Frank | 68 | Vs. State of Indiana | |
| 10 | Orr, Samuel | 97 | Jackson & Susann Orr & Liz Foster | |
| 12 | Orr, Samuel | 14 | William Ore 17 Yrs. old - MH. | |
| 27 | Orr, Samuel | 17 | Estate | |
| 61 | Orr, William | 136 | Vs. Monroe, Porcival | |
| 14 | Ort, Adam | 239 | Vs. German & Stotts | |
| 178 | Ort, Mary | 23 | George R. Harper - Guardian | |
| 181 | Orth, Ella | 182 | Vs. Rieth, Elmer | |
| 204 | Osborn, Frank | 24 | Vs. Empire Cream Separater Co. | |
| 204 | Osborn, Frank A. | 52 | Vs. Van Camp Hardware & Iron Co. | |
| 131 | Osborn, Ira | 69 | Vs. Brown, Hattie M. | |
| 11 | Osborn, James | 98 | Lana, Semeintha & Angeline Osborn | |
| 12 | Osborn, James | 31 | Elizabeth, Sanah, Samantha, Angeline & Mary | |
| 37 | Osborn, James | 36 | Sarah Osborn | |
| 188 | Osborn, John N. | 26 | D. 20 Nov 1903 - Addie Pangburn - daughter | |
| 164 | Osborn, John R. | 9 | S.B. Whisler - Admr. | |
| 155 | Osborn, Louisa | 37 | Widower - Jesse - Rhoda & Henry - MH. | |
| 8 | Osborn, Nathan B. | 57 | Samuel and Sarah Osborn - MH. | |
| 77 | Osborn, Nathan P. | son Alvan - daughter Idah |
| 55 | Osborn, Orpha J. | 142 | Vs. William Osborn | |||
| 14 | Osborn, Richard | 112 | 1880 Petit Juror - York TWP. | |||
| 152 | Osborne, Ira | 64 | Vs. Shigley, John C. | |||
| 145 | Osborne, Louisa I. | 30 | Jesse Osborne - Admr. | |||
| 128 | Osborne, Peter B. | 4 | D. 26 Mar 1897 | |||
| 60 | Osburn, Francis | 157 | Vs. Strickler Almon | |||
| 58 | Osterhous, John | 7 | Rachel - MH. - 5Yrs. old - 27 Jan 1893 | |||
| 131 | Osterhout & Fox Lumber | 67 | Vs. Griner, Adam & William | |||
| 170 | Ostrander, Frank | 84 | Vs. State of Indiana | |||
| 214 | Oswalt, Carl Jr. | 4 | Vs. State of Indiana | |||
| 134 | Ott, Amelia | 11 | D. 22 Apr 1871 | |||
| 99 | Ott, Benjamin | 189 | Vs. Gillet, Allen | |||
| 65 | Ott, David | 44 | Vs. Harris, Joseph | |||
| 209 | Ott, David | 62 | Leoti Juday - MH. - grandaughter | |||
| 231 | Ott, David | 22 | Widow - Sarah Catherine Ott - Edward & Walter | |||
| 234 | Ott, Elizabeth | 98 | Vs. State of Indiana | |||
| 14 | Ott, Feidel | 4 | Mary, Trissia, John, Leunesse & Margaret | |||
| 10 | Ott, Fidile | 144 | Minor Heirs | |||
| 258 | Ott, Franklin & Margaret | 12 | Monroe Ott - Guardian | |||
| 64 | Ott, Fredrick & Jacob | 59 | Vs. Black, Samuel L. | |||
| 116 | Ott, J. George | 17 | D. 29 May 1892 | |||
| 98 | Ott, Jacob | 106 | Vs. Evans, Stephen | |||
| 104 | Ott, Noah | 67 | May Butt - Daughter and Admr. | |||
| 119 | Ott, Samuel | 5 | Franklin Ott - Admr. | |||
| 169 | Ott, Susanna | 118 | Lelia M. Judy - MH. | |||
| 222 | Ott, Susannah | 23 | Jacob Ott - Guardian | |||
| 231 | Ott, Susannah | 19 | Brother - David Ott | |||
| 47 | Ott, Teresa | 66 | Feedel, widower - Hannah Kohler, daughter | |||
| 160 | Ott, Thomas | 2 | Glenwood Ott - MH. - Oscar O. Ott - Guardian | |||
| 255 | Ott, Walter | 30 | Vs. State of Indiana | |||
| 116 | Ott, William | 6 | D. 5 Apr. 1891 - Isaac Grimes - Admr. | |||
| 225 | Otto, Daniel | 8 | Bessie Otto - MH. - Sarah Otto - Guardian | |||
| 186 | Otto, Daniel F. | 30 | Widow - Sarah Otto | |||
| 190 | Otto, John | 123 | D. 7 Apr 1900 - Continued on Film 191 | |||
| 191 | Otto, John | 1 | Widow - Polly Otto - Continued from Film 190 | |||
| 186 | Otto, Polly | 6 | Children - Daniel & Sophia A. Bechtel | |||
| 154 | Ouderkirk, Andrew N. | 4 | Lovina & Charles Ouderkirk | |||
| 131 | Ouellet, Octave | 189 | Vs. American Hay Co. | |||
| 132 | Ourand, George W. | 31 | Ephriam Culp - Admr. | |||
| 62 | Ourand, James | 190 | Vs. Autlman, C. & Co. | |||
| 216 | Overhalt, Betty Marie | 63 | Vs. State of Indiana | |||
| 172 | Overholser, Christena | 150 | Ellen, Minerva, Nettie & Monroe | |||
| 214 | Overholser, Christena | 74 | Beulah & Noble - MH. | |||
| 174 | Overholser, George | 76 | Monroe, William, Alice, Alonzo & Ethel | |||
| 221 | Overholser, John | 71 | Widow-Christena- Ellen, Monroe, Minerva, Hattie & others | |||
| 263 | Overholser, John | 12 | Lloyde & Blanche - MH. | |||
| 198 | Overholt, Ella | 13 | Vs. State of Indiana | |||
| 204 | Overholt, John | 60 | Widow - Lydiann - Alla, William, Bertha & Rufus | |||
| 181 | Overholt, Malvin | 174 | Vs. Husel, Jacob | |||
| 225 | Overholt, Samuel | 12 | Fredinand, Frank & Lora | |||
| 19 | Overholt, William | 4 | Isaac, Jonas, Sam, Wm. Mag., Dick & Mary | |||
| 265 | Overholtzer, George | 23 | Isaac, Harold, Ida, Ruth & Hazel Border - MH. | |||
| 54 | Overleas, Henry &Mary | 129 | Vs. Latta, P.M. | |||
| 31 | Overlease, Henry | 53 | Lewis, Henry,and Adam Leutz - MH. | |||
| 207 | Overlease, Henry | 93 | Vs. Topper, Henry | |||
| 245 | Overlease, Herbin | 47 | Vs. State of Indiana | |||
| 131 | Overlees, Cora | 45 | Vs. Overlees, James | |||
| 71 | Overlees, Henry | 14 | George - Son | |||
| 66 | Overlees, James | 69 | From Davis, Joel & Wife - Warranty Deed | |||
| 131 | Overlees, James | 46 | Vs. Overlees, Cora | |||
| 66 | Overlees, James & Wife | 70 | To Davis Hiram - Warranty Deed | |||
| 206 | Overleese, Henry | 67 | Peter Hoffman | |||
| 259 | Ovilvie, Andrew | 25 | Mary Oliver - MH. | |||
| 175 | Owen, Daniel W. | 80 | Admission to the Bar | |||
| 98 | Owen, Edwin | 108 | Vs. Fetch, Anna & Lee, Alva B. | |||
| 38 | Owen, Henry | 42 | Estate | |||
| 102 | Owens, Belle | 32 | R.J. Shank - Guardian | |||
| 211 | Oxander, Charles | 103 | Vs. State of Indiana | |||
| 205 | Oxby, Elizabeth | 20 | (Will)- David Neidig - Admr. | |||
| 199 | Oxby, John | 31 | Elizabeth Oxby | |||
| 107 | Oxender, Adam | 2 | Howard, Allen, Frank & Lewis | |||
| 147 | Oxenford, Sarah A. | 11 | Charlotte Ward, Sarah Oxenford (Live in England) | |||
| 95 | Oxinder, Adam | 72 | Vs. Aldrich, Charles |