1851 Census - surnames beginning with I
| Last Name | First Name | Age | Parish | Piece | Folio | Page |
| ICK | Emma F. | 30 | Onchan | 2525 | 37 | 85 |
| ICK | Priscilla E. | 26 | Onchan | 2525 | 37 | 85 |
| INCHBALD | J. W. (m) | 54 | Onchan | 2525 | 84 | 145 |
| INCHBALD | Lousiana | 53 | Onchan | 2525 | 84 | 145 |
| INCHBALD | W. R. (m) | 24 | Onchan | 2525 | 84 | 145 |
| INGAN | Ellen | 22 | Douglas | 2525 | 282 | 200 |
| INGLES | Charles | 48 | Onchan | 2525 | 63 | 12 |
| INGLIS | Daniel | 13 | Maughold | 2524 | 277 | 53 |
| INGLIS | Elizabeth | 9 | Maughold | 2524 | 277 | 53 |
| INGLIS | John | 14 | Douglas | 2525 | 311 | 43 |
| INGLES | Marianne | 18 | Onchan | 2525 | 69 | 43 |
| INGLIS | Thomas | 13 | Maughold | 2524 | 277 | 53 |
| INGRAM | Janet | 20 | Onchan | 2525 | 100 | 60 |
| INNES | Isabel | 56 | Onchan | 2525 | 87 | 171 |
| INNES | William | 66 | Onchan | 2525 | 87 | 171 |
| IRVING | James | 55 | Braddan | 2525 | 424 | 14 |
| ISEDALE | Anne | 45 | Douglas | 2525 | 355 | 105 |
| ISDALE | Anne | 9 | Douglas | 2525 | 333 | 231 |
| ISEDALE | Catherine | 60 | Douglas | 2525 | 322 | 133 |
| ISDALE | Catherine | 11 | Douglas | 2525 | 333 | 231 |
| ISDALE | Frances | 4 | Douglas | 2525 | 333 | 231 |
| ISDALE | Isabella | 38 | Douglas | 2525 | 333 | 231 |
| ISDALE | James | 40 | Douglas | 2525 | 333 | 231 |
| ISEDALE | John Charles | 17 | Douglas | 2525 | 355 | 105 |
| ISDEEL | Sarah | 23 | Onchan | 2525 | 29 | 32 |
| ISEDALE | William | 15 | Douglas | 2525 | 355 | 105 |
| ISDALE | William | 7 | Douglas | 2525 | 333 | 231 |