1861 Census - surnames beginning with O
| Last Name | First Name | Age | Parish | Piece | Folio | Page |
| O'BRIEN | Ann P. | 37 | Lezayre | 4422 | 76 | 2 |
| O'BRIEN | Jonathan | 35 | Lezayre | 4422 | 76 | 2 |
| O'BRIEN | Percy Donald | 4 | Lezayre | 4422 | 76 | 2 |
| O'CONNOR | Catherine | 30 | Douglas | 4417 | 18 | 182 |
| O'CONNOR | Charles | 38 | Douglas | 4418 | 76 | 198 |
| O'CONNOR | Dora | 11 | Douglas | 4417 | 18 | 182 |
| O'CONNOR | Fitzgibbon | 8 | Douglas | 4417 | 18 | 182 |
| O'CONNOR | George | 12 | Malew | 4424 | 28 | 69 |
| O'CONNOR | John | 11 | Douglas | 4418 | 76 | 198 |
| O'CONNOR | Mary A. | 26 | Douglas | 4416 | 17 | 130 |
| O'CONNOR | Rose | 82 | Castletown | 4414 | 53 | 109 |
| O'DONNELLY | Mary | 58 | Douglas | 4416 | 4 | 2 |
| O'HARA | Edward | 45 | Douglas | 4418 | 65 | 105 |
| O'HARA | Elizabeth | 11 | Douglas | 4418 | 65 | 105 |
| O'HARA | James | 8 | Douglas | 4418 | 65 | 105 |
| O'HARA | Mary Ann | 20 | Douglas | 4419 | 18 | 185 |
| O'HARA | Mary | 6 | Douglas | 4418 | 65 | 105 |
| O'HARA | Ronay | 4 | Douglas | 4418 | 65 | 105 |
| O'HARA | Sarah | 44 | Douglas | 4418 | 65 | 105 |
| O'HARE | Eliza | 18 | Douglas | 4417 | 56 | 185 |
| O'HARE | Esther J. | 6 mos | Douglas | 4416 | 122 | 427 |
| O'HARE | Isabella | 27 | Douglas | 4416 | 122 | 427 |
| O'HEAR | James | 22 | Castletown | 4414 | 29 | 74 |
| O'HARE | John | 28 | Douglas | 4416 | 122 | 427 |
| O'HARE | Richard | 15 | Douglas | 4417 | 56 | 185 |
| OKELL | Caroline | 7 | Douglas | 4419 | 93 | 130 |
| OKELL | Charles Samuel | 9 | Douglas | 4419 | 93 | 130 |
| OKELL | Constance A. | 1 | Onchan | 4415 | 76 | 193 |
| OKELL | Douglas E. | 7 | Onchan | 4415 | 76 | 193 |
| OKELL | Eliza | 10 | Douglas | 4419 | 93 | 130 |
| OKELL | Frances M. | 5 | Onchan | 4415 | 76 | 193 |
| OKELL | Jane | 36 | Douglas | 4419 | 93 | 130 |
| OKELL | Joseph | 8 | Onchan | 4415 | 60 | 60 |
| OKELL | Margaret | 71 | Onchan | 4415 | 76 | 188 |
| OKELL | Margaret | 35 | Onchan | 4415 | 76 | 193 |
| OKELL | William | 42 | Onchan | 4415 | 76 | 193 |
| OKELL | William H. | 8 | Onchan | 4415 | 76 | 193 |
| O'MARA | Catherine | 62 | Douglas | 4419 | 16 | 162 |
| O'MARA | Catherine | 24 | Douglas | 4419 | 16 | 162 |
| O'MARA | Lizzey | 4 | Douglas | 4419 | 16 | 162 |
| O'NEAL | Elizabeth | 36 | Douglas | 4419 | 16 | 163 |
| O'KNEALE | James | 77 | Douglas | 4419 | 11 | 99 |
| O'NEAL | John | 2 | Douglas | 4419 | 16 | 163 |
| O'NEIL | Margaret M. | 1 | Michael | 4431 | 10 | 59 |
| O'NEAL | Thomas | 4 | Douglas | 4419 | 16 | 163 |
| O'NEAL | William | 45 | Douglas | 4419 | 16 | 163 |
| O'NEIL | William M. | 14 | Douglas | 4418 | 25 | 15 |
| O'NEAL | William | 13 | Douglas | 4419 | 16 | 163 |
| O'RIELY | Anna | 44 | Onchan | 4415 | 60 | 63 |
| O'RIELY | John N. | 40 | Onchan | 4415 | 60 | 63 |
| O'TOOLE | Fiall D. | 72 | Douglas | 4419 | 109 | 84 |
| O'TOOLE | John M. | 38 | Douglas | 4419 | 109 | 84 |
| OATES | Ann | 66 | Lon | 4423 | 87 | 53 |
| OATES | Ann | 40 | Onchan | 4415 | 80 | 210 |
| OATES | Ann | 18 | Douglas | 4418 | 19 | 186 |
| OATES | Ann | 14 | Santon | 4432 | 6 | 21 |
| OATS | Ann | 10 | German | 4420 | 22 | 25 |
| OATES | Catherine | 60 | Santon | 4432 | 6 | 21 |
| OATS | Catherine | 50 | Lezayre | 4422 | 8 | 35 |
| OATES | Catherine | 44 | Braddan | 4412 | 47 | 34 |
| OATES | Catherine | 29 | Douglas | 4419 | 61 | 137 |
| OATES | Catherine | 29 | Malew | 4424 | 9 | 54 |
| OATES | Catherine | 19 | Braddan | 4412 | 47 | 34 |
| OATES | Catherine | 19 | Santon | 4432 | 6 | 21 |
| OATS | Catherin I. | 11 | Douglas | 4417 | 53 | 147 |
| OATES | Catherine | 9 | Malew | 4424 | 9 | 54 |
| OATES | Catherine | 8 | Onchan | 4415 | 80 | 210 |
| OATS | Catherine | 3 | German | 4420 | 22 | 25 |
| OATES | Edward | 67 | Lon | 4423 | 87 | 53 |
| OATES | Edward | 55 | Braddan | 4412 | 47 | 34 |
| OATES | Edward | 24 | Braddan | 4412 | 47 | 34 |
| OATES | Eleanor | 47 | Santon | 4432 | 23 | 53 |
| OATS | Eleanor | 11 | Douglas | 4418 | 15 | 136 |
| OATES | Eleanor | 11 | Santon | 4432 | 23 | 53 |
| OATS | Elizabeth | 45 | German | 4420 | 22 | 25 |
| OATS | Elizabeth | 22 | Douglas | 4419 | 55 | 81 |
| OATS | Elizabeth | 18 | Braddan | 4412 | 11 | 69 |
| OATES | Eliza | 18 | Lezayre | 4422 | 65 | 54 |
| OATES | Elizabeth | 16 | Rushen | 4430 | 71 | 128 |
| OATS | Elizabeth | 14 | Ramsey | 4429 | 12 | 75 |
| OATES | Elizabeth | 8 | Braddan | 4412 | 47 | 34 |
| OATS | Eliza Ann | 11 mos | Douglas | 4419 | 55 | 81 |
| OATES | Emily | 5 | Braddan | 4412 | 47 | 34 |
| OATES | Esther | 6 | German | 4420 | 40 | 5 |
| OATES | Esther | 4 | Malew | 4424 | 9 | 54 |
| OATS | Frances | 33 | Douglas | 4418 | 66 | 120 |
| OATES | Frederick | 9 | Douglas | 4418 | 19 | 186 |
| OATES | Hannah | 11 | Braddan | 4412 | 47 | 34 |
| OATES | Harriet | 10 mos | Braddan | 4412 | 47 | 34 |
| OATES | Isabella | 45 | Onchan | 4415 | 5 | 15 |
| OATES | Isabella | 17 | Braddan | 4412 | 47 | 34 |
| OATS | Jabet | 33 | Douglas | 4419 | 55 | 81 |
| OATES | James | 66 | Onchan | 4415 | 5 | 15 |
| OATES | James | 47 | Douglas | 4418 | 19 | 186 |
| OATES | James | 47 | Onchan | 4415 | 9 | 51 |
| OATES | James | 32 | Douglas | 4416 | 59 | 116 |
| OATES | James | 17 | Santon | 4432 | 23 | 53 |
| OATES | James | 8 | German | 4420 | 40 | 5 |
| OATES | James | 3 | Douglas | 4418 | 19 | 186 |
| OATES | Jane | 70 | Douglas | 4418 | 12 | 87 |
| OATES | Jane | 66 | Michael | 4431 | 21 | 9 |
| OATES | Jane | 60 | Onchan | 4415 | 9 | 51 |
| OATES | Jane | 60 | Patrick | 4427 | 76 | 73 |
| OATES | Jane | 45 | German | 4420 | 40 | 5 |
| OATES | Jane | 35 | Douglas | 4417 | 4 | 2 |
| OATES | Jane | 33 | Douglas | 4416 | 59 | 116 |
| OATES | Jane | 26 | Michael | 4431 | 21 | 9 |
| OATES | John | 68 | Michael | 4431 | 21 | 9 |
| OATES | John | 65 | Douglas | 4419 | 10 | 83 |
| OATES | John | 51 | Onchan | 4415 | 80 | 210 |
| OATES | John | 50 | Santon | 4432 | 23 | 53 |
| OATS | John | 46 | Onchan | 4415 | 9 | 58 |
| OATES | John James | 18 | Onchan | 4415 | 5 | 15 |
| OATS | John | 13 | Peel | 4428 | 21 | 163 |
| OATES | John | 11 | Onchan | 4415 | 80 | 210 |
| OATES | John | 9 | Santon | 4432 | 23 | 53 |
| OATES | John J. | 7 | Douglas | 4416 | 59 | 116 |
| OATS | John G. | 2 | Douglas | 4419 | 55 | 81 |
| OATES | Louisa | 26 | Michael | 4431 | 20 | 7 |
| OATES | Louisa | 1 | Michael | 4431 | 20 | 7 |
| OATES | Margaret | 73 | German | 4420 | 40 | 9 |
| OATS | Margaret | 50 | Ramsey | 4429 | 93 | 132 |
| OATS | Margaret | 44 | Douglas | 4417 | 53 | 147 |
| OATES | Margaret | 36 | Lon | 4423 | 75 | 163 |
| OATS | Margaret | 30 | Ramsey | 4429 | 83 | 20 |
| OATES | Margaret | 21 | Braddan | 4412 | 47 | 34 |
| OATES | Margaret | 13 | Onchan | 4415 | 80 | 210 |
| OATES | Margaret A. | 3 | Santon | 4432 | 23 | 53 |
| OATES | Margaret | 2 | Malew | 4424 | 9 | 54 |
| OATES | Maria | 42 | Douglas | 4418 | 19 | 186 |
| OATES | Mary | 93 | Michael | 4431 | 20 | 7 |
| OATES | Mary | 75 | Douglas | 4417 | 4 | 2 |
| OATS | Mary | 63 | Patrick | 4427 | 43 | 75 |
| OATS | Mary | 36 | Onchan | 4415 | 9 | 58 |
| OATES | Mary | 32 | Douglas | 4416 | 34 | 254 |
| OATES | Mary Ann | 28 | Lon | 4423 | 87 | 53 |
| OATES | Mary Ann | 14 | Lon | 4423 | 75 | 163 |
| OATS | Mary E. | 14 | Ramsey | 4429 | 93 | 132 |
| OATES | Mary A. | 4 | Douglas | 4416 | 59 | 116 |
| OATES | Mary | 2 | Douglas | 4419 | 61 | 137 |
| OATS | Patty | 8 | Ramsey | 4429 | 12 | 75 |
| OATES | Robert | 63 | German | 4420 | 40 | 9 |
| OATES | Robert | 49 | Michael | 4431 | 20 | 7 |
| OATS | Robert | 13 | German | 4420 | 22 | 25 |
| OATES | Robert | 13 | Santon | 4432 | 23 | 54 |
| OATES | Robert | 9 | German | 4420 | 40 | 5 |
| OATES | Robert | 7 | Douglas | 4418 | 19 | 186 |
| OATES | Robert E. | 2 | Douglas | 4416 | 59 | 116 |
| OATES | Samuel | 6 | Santon | 4432 | 23 | 53 |
| OATES | Stephen | 13 | Lon | 4423 | 75 | 163 |
| OATES | Susan | 14 | German | 4420 | 40 | 5 |
| OATES | Thomas | 82 | Santon | 4432 | 6 | 21 |
| OATS | Thomas | 56 | German | 4420 | 22 | 25 |
| OATES | Thomas | 50 | German | 4420 | 40 | 5 |
| OATES | Thomas | 26 | Douglas | 4419 | 61 | 137 |
| OATES | Thomas | 15 | Santon | 4432 | 6 | 22 |
| OATES | Thomas | 12 | German | 4420 | 40 | 5 |
| OATES | Thomas | 3 | Douglas | 4416 | 34 | 254 |
| OATS | William | 63 | Patrick | 4427 | 43 | 75 |
| OATS | William | 60 | Lezayre | 4422 | 8 | 35 |
| OATES | William | 35 | Malew | 4424 | 9 | 54 |
| OATES | William | 31 | Douglas | 4416 | 34 | 254 |
| OATES | William | 17 | Michael | 4431 | 20 | 7 |
| OATES | William | 16 | Douglas | 4418 | 59 | 40 |
| OATES | William | 14 | Braddan | 4412 | 47 | 34 |
| OATES | William | 7 | Malew | 4424 | 9 | 54 |
| OATS | William | 5 | Ramsey | 4429 | 12 | 75 |
| OCKERBY | Featherstone | 24 | Arbory | 4409 | 27 | 77 |
| OCKERBY | Mary | 51 | Arbory | 4409 | 27 | 77 |
| OCKERBY | William | 66 | Arbory | 4409 | 27 | 77 |
| ODEN | John | 15 | Malew | 4424 | 62 | 60 |
| OLDHAM | George | 42 | Ramsey | 4429 | 24 | 8 |
| OLDHAM | George R. | 14 | Ramsey | 4429 | 24 | 8 |
| OLDHAM | Helen | 40 | Ramsey | 4429 | 24 | 8 |
| OLDHAM | Joseph R. | 13 | Ramsey | 4429 | 24 | 8 |
| OLDRIGE | Elizabeth | 60 | Castletown | 4414 | 57 | 145 |
| OLIVER | Alexander | 59 | Castletown | 4414 | 56 | 139 |
| OLIVER | Ann | 46 | Lon | 4423 | 26 | 194 |
| OLIVER | Anne | 15 | Castletown | 4414 | 56 | 139 |
| OLIVER | Catherine | 12 | Lon | 4423 | 26 | 194 |
| OLIVER | Catherine | 1y 6m | Maughold | 4425 | 5 | 15 |
| OLIVER | Constance B. | 1 | Douglas | 4416 | 7 | 43 |
| OLIVER | Eleanor | 6 | Lon | 4423 | 26 | 194 |
| OLIVER | Elizabeth | 40 | Douglas | 4416 | 7 | 43 |
| OLIVER | Frances | 39 | Lezayre | 4422 | 42 | 24 |
| OLIVER | Hugh | 17 | Lon | 4423 | 26 | 194 |
| OLIVER | James | 47 | Lon | 4423 | 26 | 194 |
| OLIVER | James | 2 | Lon | 4423 | 26 | 194 |
| OLIVER | Jane | 9 | Lon | 4423 | 26 | 194 |
| OLIVER | John R. | 40 | Douglas | 4416 | 7 | 43 |
| OLIVER | John | 22 | Lon | 4423 | 26 | 194 |
| OLIVER | John P. | 13 | Douglas | 4416 | 7 | 43 |
| OLIVER | Margaret | 14 | Lon | 4423 | 26 | 194 |
| OLIVER | Mary J. | 48 | Lezayre | 4422 | 42 | 24 |
| OLIVER | Mary A. | 18 | Lon | 4423 | 20 | 162 |
| OLIVER | Mary E. | 12 | Douglas | 4416 | 7 | 43 |
| OLIVER | Philip | 7 | Lezayre | 4422 | 42 | 24 |
| OLIVER | Sarah | 57 | Castletown | 4414 | 56 | 139 |
| OLLISHEAD | William W. | 25 | Andreas | 4410 | 55 | 36 |
| OMAN | Alice | 61 | Douglas | 4419 | 51 | 44 |
| ORAMOD | Frank | 12 | Douglas | 4419 | 105 | 53 |
| ORE | Clara H. | 9 | Castletown | 4414 | 10 | 77 |
| ORR | Daniel | 3 | Lon | 4423 | 71 | 116 |
| ORR | Elizabeth | 46 | Douglas | 4416 | 53 | 40 |
| ORR | Elizabeth | 27 | Ballaugh | 4411 | 41 | 16 |
| ORE | Eliza | 14 | Castletown | 4414 | 10 | 77 |
| ORR | Elizabeth | 9 | Lon | 4423 | 71 | 116 |
| ORR | Esther | 32 | German | 4420 | 10 | 55 |
| ORE | James | 36 | Arbory | 4409 | 28 | 83 |
| ORR | James | 36 | Lon | 4423 | 71 | 116 |
| ORR | James | 6 | Lon | 4423 | 71 | 116 |
| ORE | James | 5 | Arbory | 4409 | 28 | 83 |
| ORE | Jane | 10 | Arbory | 4409 | 28 | 83 |
| ORR | John | 36 | German | 4420 | 10 | 55 |
| ORE | Margaret | 29 | Arbory | 4409 | 28 | 83 |
| ORR | Mary | 30 | Lon | 4423 | 71 | 116 |
| ORE | Rebecca | 13 | Castletown | 4414 | 10 | 77 |
| ORE | Richard | 40 | Castletown | 4414 | 10 | 77 |
| ORE | Richard | 11 | Castletown | 4414 | 10 | 77 |
| ORE | Sarah | 43 | Castletown | 4414 | 10 | 77 |
| ORE | Sarah Ann | 16 | Castletown | 4414 | 10 | 77 |
| ORE | Sophia | 5 mos | Arbory | 4409 | 28 | 83 |
| ORE | Thomas | 6 | Arbory | 4409 | 28 | 83 |
| ORR | William | 37 | Douglas | 4416 | 88 | 8 |
| ORGEAN | Ellen J. | 11 | Douglas | 4417 | 26 | 244 |
| ORGEAN | Jane | 36 | Douglas | 4417 | 26 | 244 |
| ORMSBY | Frances | 92 | Douglas | 4419 | 82 | 25 |
| ORMSTEAD | Ann | 35 | German | 4420 | 48 | 70 |
| ORMSTEAD | Catherine Jane | 6 | German | 4420 | 48 | 70 |
| ORMSTEAD | Edward | 40 | German | 4420 | 48 | 70 |
| ORMSTEAD | Edward | 11 | German | 4420 | 48 | 70 |
| ORMSTEAD | John Thomas | 3 | German | 4420 | 48 | 70 |
| OSBORNE | Arabella | 7 | Maughold | 4425 | 13 | 103 |
| OSBORNE | Edith | 6 | Lon | 4423 | 68 | 82 |
| OSBORNE | Elizabeth | 21 | Douglas | 4419 | 31 | 7 |
| OSBORNE | Bessie | 3 | Maughold | 4425 | 13 | 103 |
| OSBORNE | Emma | 18 | Onchan | 4415 | 29 | 53 |
| OSBORNE | Ernest A | 6 | Maughold | 4425 | 13 | 103 |
| OSBOURNE | Harriet | 25 | Douglas | 4416 | 37 | 286 |
| OSBORNE | Herbert | 1 mon | Maughold | 4425 | 13 | 103 |
| OSBORNE | Isabella | 30 | Maughold | 4425 | 13 | 103 |
| OSBORNE | Jane | 38 | Lon | 4423 | 68 | 82 |
| OSBORNE | John F. | 3 | Lon | 4423 | 68 | 82 |
| OSBORNE | Joseph | 59 | Onchan | 4415 | 29 | 53 |
| OSBORNE | Mira | 13 | Onchan | 4415 | 29 | 53 |
| OSBORNE | Richard | 1 | Maughold | 4425 | 13 | 103 |
| OSBURN | Sophia | 69 | Douglas | 4419 | 87 | 62 |
| OSBORNE | Stephen | 30 | Maughold | 4425 | 13 | 103 |
| OSBORNE | William | 40 | Lon | 4423 | 68 | 82 |
| OSBORNE | William F. | 10 | Maughold | 4425 | 13 | 103 |
| OSWALD | Charles E. | 4y 6m | Douglas | 4419 | 32 | 20 |
| OSWALD | Henry | 8 | Douglas | 4419 | 105 | 53 |
| OSWALD | Percy C. | 7 | Douglas | 4419 | 32 | 20 |
| OSWALD | R. H. (m) | 70 | Douglas | 4419 | 32 | 20 |
| OSWALD | Sarah H. | 64 | Douglas | 4419 | 32 | 20 |
| OVINGTON | Ann Jane | 10 | Douglas | 4419 | 111 | 101 |
| OVINGTON | Milicent S. | 11 | Douglas | 4419 | 111 | 101 |
| OWEN | Eunice | 60 | Douglas | 4418 | 32 | 88 |
| OWEN | Harriet | 66 | Douglas | 4419 | 56 | 86 |
| OWEN | Sarah J. | 20 | Marown | 4426 | 9 | 60 |
| OWENS | Amelia E. | 12 | Douglas | 4419 | 103 | 23 |
| OWENS | David | 39 | Ramsey | 4429 | 45 | 5 |
| OWENS | Emily E. | 16 | Douglas | 4419 | 103 | 23 |
| OWENS | George | 34 | Douglas | 4419 | 6 | 35 |
| OWENS | Henry | 55 | Douglas | 4416 | 129 | 499 |
| OWENS | Sarah | 60 | Douglas | 4416 | 129 | 499 |
| OWENS | William F. J. | 15 | Douglas | 4419 | 103 | 23 |