1871 Census - surnames beginning with O
| Last Name | First Name | Age | Parish | Piece | Folio | Page |
| O'BENNETT | Brian | 70 | Douglas | 5776 | 7 | 64 |
| O'BENNETT | Margaret | 35 | Douglas | 5776 | 7 | 64 |
| O'BRYAN | Mary | 60 | Douglas | 5775 | 64 | 182 |
| O'BRIAN | Mary | 35 | Douglas | 5775 | 29 | 130 |
| O'BRYAN | Michael | 50 | Douglas | 5775 | 64 | 182 |
| O'BRIEN | Thomas | 27 | Malew | 5777 | 165 | 20 |
| O'BRYAN | William | 9 | Douglas | 5775 | 64 | 182 |
| O'CONNOR | John | 21 | Douglas | 5775 | 29 | 126 |
| O'CONNOR | Mary | 23 | Ramsey | 5773 | 130 | 77 |
| O'DONNELL | John | 23 | Douglas | 5776 | 69 | 108 |
| O'FEE | John | 52 | Ramsey | 5773 | 126 | 39 |
| O'HALLAN | Maria | 31 | Douglas | 5775 | 97 | 258 |
| O'HARA | Ann | 36 | Douglas | 5776 | 129 | 185 |
| O'HARA | Edward | 54 | Douglas | 5775 | 69 | 246 |
| O'HARA | Eleanor | 26 | Douglas | 5776 | 51 | 238 |
| O'HARA | Isabella | 36 | Douglas | 5775 | 11 | 120 |
| O'HARA | James | 16 | Douglas | 5775 | 69 | 246 |
| O'HARA | John | 40 | Douglas | 5775 | 11 | 120 |
| O'HARA | John | 5 | Douglas | 5775 | 11 | 120 |
| O'HARA | Joseph | 21 | Douglas | 5775 | 69 | 246 |
| O'HARA | Margaret | 8 | Douglas | 5775 | 11 | 120 |
| O'HARA | Mary | 14 | Douglas | 5775 | 70 | 246 |
| O'HARA | Richard | 25 | Douglas | 5776 | 51 | 238 |
| O'HARA | Robert William | 2 mos | Douglas | 5776 | 51 | 238 |
| O'HARA | Sarah | 54 | Douglas | 5775 | 69 | 246 |
| O'HARA | William | 3 | Douglas | 5775 | 11 | 120 |
| OKELL | Charles P. | 6 | Douglas | 5775 | 173 | 144 |
| OKELL | Constance A. | 11 | Douglas | 5775 | 173 | 144 |
| OKELL | Douglas George | 17 | Douglas | 5775 | 172 | 144 |
| OKELL | Frances M. | 15 | Douglas | 5775 | 173 | 144 |
| OKELL | Joseph | 19 | Onchan | 5774 | 108 | 107 |
| OKELL | Margaret | 79 | Douglas | 5775 | 165 | 67 |
| OKELL | Margaret | 45 | Douglas | 5775 | 172 | 144 |
| OKELL | William | 52 | Douglas | 5775 | 172 | 144 |
| OKELL | William Henry | 18 | Douglas | 5775 | 172 | 144 |
| O'KILLEY | Margaret | 46 | Onchan | 5774 | 103 | 50 |
| O'KILLEY | Terence | 56 | Onchan | 5774 | 103 | 50 |
| O'NEIL | Bridget | 34 | Douglas | 5776 | 180 | 179 |
| O'NEIL | Catherine | 27 | Ramsey | 5773 | 130 | 77 |
| O'NEIL | Catherine | 14 | Douglas | 5776 | 180 | 179 |
| O'NEIL | Charles | 19 | Douglas | 5776 | 91 | 133 |
| O'NEIL | Charles | 4 | Douglas | 5776 | 180 | 179 |
| O'NEIL | James | 12 | Douglas | 5776 | 180 | 179 |
| O'NEIL | John | 33 | Douglas | 5776 | 180 | 179 |
| O'NEIL | John | 7 | Douglas | 5776 | 180 | 179 |
| O'NEIL | Margaret | 55 | Douglas | 5776 | 92 | 148 |
| O'NEIL | Margaret | 1 | Douglas | 5776 | 180 | 179 |
| O'NEIL | Mary | 58 | Douglas | 5776 | 91 | 133 |
| O'NEIL | Robert | 36 | Vessels | 5771 | 208 | 48 |
| O'NEIL | Thomas | 4 | Douglas | 5776 | 180 | 179 |
| O'ROURKE | Margaret | 68 | Douglas | 5775 | 40 | 225 |
| O'TOOLE | Fiolt D'Auvergne | 82 | Douglas | 5775 | 120 | 42 |
| OAKDEN | Ada | 5 | Douglas | 5776 | 131 | 210 |
| OAKDEN | Alice | 7 | Douglas | 5775 | 37 | 186 |
| OAKDEN | Ann | 41 | Douglas | 5775 | 106 | 53 |
| OAKDEN | Ann E | 31 | Douglas | 5776 | 131 | 210 |
| OAKDEN | Frederick J | 3 | Douglas | 5776 | 131 | 210 |
| OAKDEN | John | 4 | Douglas | 5775 | 106 | 53 |
| OAKDEN | Robin E | 15 | Douglas | 5775 | 106 | 53 |
| OAKDEN | William | 8 | Douglas | 5775 | 106 | 53 |
| OATES | Agnes | 9 | Malew | 5777 | 89 | 31 |
| OATES | Alice | 3 | Michael | 5772 | 52 | 55 |
| OATS | Catherine | 70 | Santon | 5777 | 67 | 13 |
| OATES | Catherine | 68 | Ballaugh | 5772 | 87 | 5 |
| OATES | Catherine | 53 | Braddan | 5777 | 25 | 73 |
| OATES | Catherine | 46 | Lezayre | 5773 | 38 | 13 |
| OATES | Catherine | 40 | Douglas | 5775 | 137 | 39 |
| OATES | Catherine | 38 | Malew | 5777 | 89 | 31 |
| OATES | Catherine | 33 | Douglas | 5776 | 146 | 94 |
| OATES | Catherine | 28 | Braddan | 5777 | 25 | 73 |
| OATES | Catherine | 27 | Douglas | 5775 | 30 | 138 |
| OATES | Catherine Jane | 21 | Douglas | 5776 | 20 | 192 |
| OATES | Catherine | 14 | German | 5771 | 101 | 76 |
| OATES | Catherine | 10 | Lonan | 5774 | 89 | 32 |
| OATES | Catherine | 1 | Douglas | 5776 | 110 | 329 |
| OATES | Catherine E | 1 | Douglas | 5776 | 146 | 94 |
| OATES | Charlotte J | 13 | Douglas | 5776 | 146 | 94 |
| OATES | Christian | 39 | Douglas | 5776 | 145 | 87 |
| OATES | Edward | 64 | Braddan | 5777 | 25 | 73 |
| OATES | Edward | 36 | Douglas | 5775 | 48 | 47 |
| OATES | Edward C | 11 | Douglas | 5776 | 146 | 94 |
| OATES | Ellen | 20 | Lonan | 5774 | 19 | 129 |
| OATES | Elizabeth | 54 | German | 5771 | 101 | 76 |
| OATES | Elizabeth | 30 | Santon | 5777 | 68 | 26 |
| OATES | Elizabeth | 26 | Douglas | 5775 | 85 | 140 |
| OATES | Elizabeth | 22 | Douglas | 5776 | 110 | 329 |
| OATES | Emily | 14 | Braddan | 5777 | 25 | 73 |
| OATES | Ester | 14 | Malew | 5777 | 89 | 31 |
| OATES | Esther | 6 | Malew | 5777 | 149 | 12 |
| OATES | Frederick | 18 | Douglas | 5775 | 5 | 38 |
| OATES | Hannah | 20 | Braddan | 5777 | 25 | 73 |
| OATES | Hannah | 6 | Douglas | 5776 | 145 | 87 |
| OATES | Harriet | 9 | Braddan | 5777 | 25 | 73 |
| OATES | Henry | 8 | Lonan | 5774 | 89 | 32 |
| OATES | Isabella | 57 | Onchan | 5774 | 131 | 50 |
| OATES | Isabella | 41 | Onchan | 5774 | 108 | 102 |
| OATES | Isabella | 26 | Braddan | 5777 | 25 | 73 |
| OATES | James | 60 | Douglas | 5775 | 5 | 38 |
| OATES | James | 58 | Onchan | 5774 | 108 | 102 |
| OATES | James | 42 | Douglas | 5775 | 30 | 138 |
| OATES | James | 41 | Lonan | 5774 | 89 | 32 |
| OATES | James | 28 | Santon | 5777 | 68 | 26 |
| OATES | James | 19 | Patrick | 5771 | 39 | 38 |
| OATES | James | 17 | Lonan | 5774 | 89 | 23 |
| OATS | James | 16 | Santon | 5777 | 66 | 4 |
| OATS | Jane | 72 | Patrick | 5771 | 68 | 63 |
| OATES | Jane | 41 | Lonan | 5774 | 89 | 32 |
| OATES | Jessie | 9 | Douglas | 5776 | 145 | 87 |
| OATES | John | 56 | Douglas | 5775 | 68 | 223 |
| OATES | John | 38 | Douglas | 5776 | 146 | 94 |
| OATES | John | 26 | Onchan | 5774 | 131 | 50 |
| OATES | John | 19 | Malew | 5777 | 102 | 52 |
| OATES | John A | 2 | Douglas | 5776 | 146 | 94 |
| OATES | Louisa | 37 | Michael | 5772 | 52 | 55 |
| OATES | Louisa | 11 | Andreas | 5772 | 156 | 63 |
| OATES | Margaret | 60 | Douglas | 5775 | 85 | 140 |
| OATES | Margaret | 47 | Lonan | 5774 | 41 | 201 |
| OATES | Margaret | 40 | Douglas | 5776 | 20 | 192 |
| OATES | Margaret | 11 | Malew | 5777 | 89 | 31 |
| OATES | Margaret | 7 | Douglas | 5775 | 137 | 39 |
| OATES | Margaret | 2 | Patrick | 5771 | 9 | 80 |
| OATES | Margaret | 1 | Onchan | 5774 | 108 | 102 |
| OATES | Maria | 46 | Douglas | 5775 | 5 | 38 |
| OATES | Martha A | 12 | Douglas | 5775 | 137 | 39 |
| OATES | Mary | 53 | Douglas | 5775 | 68 | 223 |
| OATES | Mary A | 40 | Onchan | 5774 | 105 | 77 |
| OATES | Mary | 36 | Douglas | 5775 | 48 | 47 |
| OATES | Mary A | 15 | Onchan | 5774 | 111 | 127 |
| OATES | Matilda | 26 | Patrick | 5771 | 9 | 80 |
| OATES | Robert | 74 | Lezayre | 5773 | 38 | 13 |
| OATES | Robert | 57 | Michael | 5772 | 52 | 55 |
| OATES | Robert | 23 | Santon | 5777 | 82 | 61 |
| OATES | Robert | 22 | German | 5771 | 101 | 76 |
| OATS | Robert | 19 | Marown | 5772 | 5 | 71 |
| OATES | Robert | 16 | Douglas | 5775 | 5 | 38 |
| OATES | Robert | 12 | Lonan | 5774 | 89 | 32 |
| OATES | Robert | 2 | Malew | 5777 | 89 | 31 |
| OATES | Robina | 7 | Michael | 5772 | 52 | 55 |
| OATS | Samuel | 17 | Santon | 5777 | 81 | 56 |
| OATES | Thomas | 66 | German | 5771 | 101 | 76 |
| OATES | Thomas E | 37 | Douglas | 5775 | 137 | 39 |
| OATES | Thomas | 35 | Malew | 5777 | 149 | 12 |
| OATES | Thomas | 22 | Douglas | 5776 | 110 | 329 |
| OATES | Thomas | 22 | Lonan | 5774 | 41 | 201 |
| OATES | Thomas | 13 | Douglas | 5776 | 145 | 87 |
| OATES | Thomas | 13 | Marown | 5772 | 30 | 21 |
| OATES | Thomas | 7 | Malew | 5777 | 89 | 31 |
| OATES | Thomas | 5 | Lonan | 5774 | 89 | 32 |
| OATES | Thomas W | 4 | Douglas | 5775 | 137 | 39 |
| OATES | Thomas H | 6 mos | Douglas | 5776 | 110 | 329 |
| OATES | William | 75 | Ballaugh | 5772 | 87 | 5 |
| OATES | William | 71 | Patrick | 5771 | 9 | 80 |
| OATES | William | 42 | Malew | 5777 | 89 | 31 |
| OATES | William | 40 | Douglas | 5776 | 145 | 87 |
| OATES | William | 17 | Malew | 5777 | 89 | 31 |
| OFFOTT | Margaret | 12 | Castletown | 5777 | 181 | 150 |
| OLDCROFT | Jane L | 37 | Braddan | 5777 | 44 | 78 |
| OLDCROFT | Peter | 37 | Braddan | 5777 | 44 | 78 |
| OLDCROFT | Robert W | 1 mon | Braddan | 5777 | 44 | 78 |
| OLDHAM | Ann | 5 | Douglas | 5775 | 166 | 74 |
| OLDHAM | Edith | 1 | Douglas | 5775 | 166 | 74 |
| OLDHAM | Elizabeth | 40 | Douglas | 5775 | 166 | 74 |
| OLDHAM | George | 3 | Ramsey | 5773 | 196 | 198 |
| OLDHAM | Margaret Jane | 16 | Douglas | 5775 | 166 | 74 |
| OLDHAM | Thomas | 45 | Douglas | 5775 | 166 | 74 |
| OLDMAN | Helen | 46 | Ramsey | 5773 | 190 | 134 |
| OLDROUGH | Albert | 10 | Douglas | 5775 | 93 | 203 |
| OLDROUGH | Ann | 46 | Douglas | 5775 | 92 | 203 |
| OLDROUGH | Robert | 52 | Douglas | 5775 | 92 | 203 |
| OLDROUGH | Thomas | 11 | Douglas | 5775 | 92 | 203 |
| OLDROYD | Mary | 13 | Douglas | 5775 | 18 | 11 |
| OLIVER | Alexander | 69 | Castletown | 5777 | 220 | 173 |
| OLIVER | Catherine | 22 | Maughold | 5773 | 89 | 103 |
| OLIVER | Eleanor | 15 | Lonan | 5774 | 7 | 20 |
| OLIVER | Hugh | 25 | Lonan | 5774 | 7 | 20 |
| OLIVER | James | 12 | Lonan | 5774 | 7 | 20 |
| OLIVER | John | 32 | Lonan | 5774 | 7 | 20 |
| OLIVER | Mary | 23 | Ramsey | 5773 | 205 | 27 |
| OLIVER | Sarah | 67 | Castletown | 5777 | 221 | 173 |
| OLLERHEAD | Diana E | 6 | Jurby | 5772 | 119 | 20 |
| OLLERHEAD | Elizabeth W | 3 | Jurby | 5772 | 119 | 20 |
| OLLERHEAD | George E | 5 | Jurby | 5772 | 119 | 20 |
| OLLERHEAD | Helena H | 2 | Jurby | 5772 | 119 | 20 |
| OLLERHEAD | Mary | 38 | Jurby | 5772 | 119 | 20 |
| OLLERHEAD | Mary Q | 7 mos | Jurby | 5772 | 119 | 20 |
| OLLERHEAD | William M | 35 | Jurby | 5772 | 119 | 20 |
| ONSLOW | Jane | 28 | Ramsey | 5773 | 190 | 134 |
| OPENSHAW | James | 61 | Peel | 5771 | 159 | 211 |
| OPENSHAW | Margaret | 60 | Peel | 5771 | 159 | 211 |
| ORBERTSON | Christian | 31 | Onchan | 5774 | 103 | 51 |
| ORBERTSON | Thomas | 31 | Onchan | 5774 | 103 | 51 |
| ORBERTSON | William E | 4 | Onchan | 5774 | 103 | 51 |
| ORDERY | Robert | 20 | Peel | 5771 | 147 | 140 |
| ORR | Alfred | 6 | Lonan | 5774 | 33 | 113 |
| ORE | Elizabeth | 55 | Douglas | 5776 | 62 | 26 |
| ORR | Elizabeth | 18 | Lonan | 5774 | 33 | 113 |
| ORR | Emily | 2 | Lonan | 5774 | 33 | 113 |
| ORR | Esther | 43 | German | 5771 | 109 | 25 |
| ORR | James | 75 | Douglas | 5775 | 97 | 258 |
| ORR | James | 51 | Lonan | 5774 | 33 | 113 |
| ORR | James | 15 | Lonan | 5774 | 33 | 113 |
| ORE | Jane | 19 | Douglas | 5776 | 161 | 18 |
| ORR | John | 44 | German | 5771 | 109 | 25 |
| ORR | Mary | 39 | Lonan | 5774 | 33 | 113 |
| ORR | Mary | 21 | Ramsey | 5773 | 161 | 27 |
| ORR | Samuel | 13 | Lonan | 5774 | 33 | 113 |
| ORE | Thomas | 18 | Patrick | 5771 | 75 | 103 |
| OREWIN | George Thomas | 50 | Rushen | 5778 | 66 | 100 |
| ORMSTEAD | Edward | 48 | Vessels | 5771 | 212 | 69 |
| ORMSTEAD | Edward | 30 | Michael | 5772 | 61 | 24 |
| OSBORNE | Edith Ann | 16 | Lonan | 5774 | 78 | 103 |
| OSBOURNE | Emma | 28 | Onchan | 5774 | 119 | 44 |
| OSBOURNE | George | 33 | Onchan | 5774 | 119 | 44 |
| OSBORNE | Jane | 48 | Lonan | 5774 | 78 | 103 |
| OSBORNE | John F | 13 | Lonan | 5774 | 78 | 103 |
| OSBOURNE | Mira | 23 | Onchan | 5774 | 119 | 44 |
| OSBORNE | William | 30 | Lonan | 5774 | 78 | 103 |
| OUSLEY | Alfred R H | 19 | Douglas | 5775 | 165 | 71 |
| OUSLEY | Charles S G | 13 | Douglas | 5775 | 166 | 71 |
| OUSLEY | Elizabeth | 21 | Douglas | 5775 | 165 | 71 |
| OUSLEY | Richard S D | 51 | Douglas | 5775 | 165 | 71 |
| OUSLEY | Sophia D | 16 | Douglas | 5775 | 166 | 71 |
| OVERTON | Ann | 71 | Douglas | 5775 | 127 | 112 |
| OVERTON | Elizabeth | 42 | Douglas | 5775 | 127 | 112 |
| OVERTON | Martha | 40 | Douglas | 5775 | 127 | 112 |
| OWEN | Alice L | 20 | German | 5771 | 127 | 69 |
| OWEN | Ann | 35 | Lonan | 5774 | 71 | 29 |
| OWEN | Edith D | 12 | German | 5771 | 127 | 69 |
| OWEN | Elizabeth | 6 | Lonan | 5774 | 71 | 29 |
| OWEN | Emily M | 22 | German | 5771 | 127 | 69 |
| OWEN | Joseph | 54 | German | 5771 | 127 | 69 |
| OWEN | Martha | 51 | German | 5771 | 127 | 69 |
| OWENS | Catherine | 56 | Douglas | 5776 | 66 | 79 |
| OWENS | Henry | 60 | Douglas | 5776 | 66 | 79 |
| OWENS | Sarah | 37 | Douglas | 5775 | 54 | 105 |
| OWENS | William | 35 | Douglas | 5775 | 54 | 105 |
| OWSLEY | Frances | 58 | Douglas | 5775 | 95 | 225 |
| OWSLEY | Frances M | 30 | Douglas | 5775 | 95 | 225 |
| OWSLEY | Thomas J | 66 | Douglas | 5775 | 95 | 225 |
| OXLEY | Ann | 45 | Andreas | 5772 | 170 | 58 |