1871 Census - surnames beginning with I
| Last Name | First Name | Age | Parish | Piece | Folio | Page |
| IBBOTSON | Anne | 10 mos | Douglas | 5776 | 162 | 27 |
| IBBOTSON | Henry | 4 | Douglas | 5776 | 162 | 27 |
| IBBOTSON | Mary | 7 | Douglas | 5776 | 162 | 27 |
| IBBOTSON | Robertson | 34 | Douglas | 5776 | 162 | 27 |
| IBBOTSON | Sarah | 33 | Douglas | 5776 | 162 | 27 |
| ICRBY | Thomas | 17 | Malew | 5777 | 160 | 12 |
| ICK | Emma F | 49 | Douglas | 5775 | 96 | 237 |
| INCE | Catherine | 32 | Rushen | 5778 | 85 | 144 |
| INGLEBY | Arthur | 17 | Douglas | 5775 | 138 | 47 |
| INGLEBY | Charles | 13 | Douglas | 5775 | 138 | 47 |
| INGLEBY | Ellen | 20 | Douglas | 5775 | 121 | 58 |
| INGLEBY | Frank | 2 | Douglas | 5775 | 138 | 47 |
| INGLEBY | Margaret | 46 | Douglas | 5775 | 138 | 47 |
| INGLEBY | William | 33 | Douglas | 5775 | 138 | 47 |
| INGLIS | John | 15 | Jurby | 5772 | 124 | 9 |
| INGRAM | Catherine P | 38 | Michael | 5772 | 39 | 35 |
| INGRAM | George E R | 7 | Michael | 5772 | 39 | 35 |
| INGRAM | Jane R | 67 | Michael | 5772 | 39 | 35 |
| INGRAM | William | 37 | Michael | 5772 | 39 | 35 |
| INNISH | Esther | 59 | Lonan | 5774 | 54 | 33 |
| INNISH | James | 71 | Lonan | 5774 | 54 | 33 |
| IRELAND | Hugh P | 1 | Lonan | 5774 | 43 | 222 |
| IRELAND | John | 13 | Onchan | 5774 | 99 | 12 |
| IRELAND | John James | 2 | Lonan | 5774 | 43 | 222 |
| IRELAND | Margaret | 30 | Lonan | 5774 | 43 | 222 |
| IRELAND | William J | 45 | Lonan | 5774 | 43 | 222 |
| IRVING | Amelia M | 1 | Douglas | 5775 | 98 | 260 |
| IRVING | Augusta | 32 | Douglas | 5775 | 97 | 260 |
| IRVING | Edith | 3 | Douglas | 5775 | 97 | 260 |
| IRVINE | Margaret | 40 | Marown | 5772 | 20 | 62 |
| IRVINE | Mary | 33 | Douglas | 5775 | 20 | 35 |
| IRVING | Robert | 33 | Douglas | 5775 | 97 | 260 |
| IRVINE | Samuel | 42 | Douglas | 5775 | 20 | 35 |
| ISAAC | Elizabeth | 31 | Peel | 5771 | 181 | 23 |
| ISAAC | Emma | 7 | Peel | 5771 | 181 | 23 |
| ISDALE | James | 9 | Douglas | 5776 | 115 | 4 |
| ISDALE | Sarah | 41 | Douglas | 5776 | 115 | 4 |
| ISDALE | Sarah A | 8 | Douglas | 5776 | 115 | 4 |
| ISDALE | William | 37 | Douglas | 5776 | 115 | 4 |
| ISHERWOOD | Elizabeth | 15 | Braddan | 5777 | 4 | 12 |
| ISHERWOOD | Emma | 5 | Braddan | 5777 | 4 | 12 |
| ISHERWOOD | Esther J | 8 | Braddan | 5777 | 4 | 12 |
| ISHERWOOD | Mary | 14 | Douglas | 5776 | 116 | 13 |
| ISHERWOOD | Sarah | 38 | Braddan | 5777 | 4 | 12 |
| ISHERWOOD | William J | 38 | Braddan | 5777 | 4 | 12 |