| Surname | Forenames | Relation to Head | Marital Status | Age | Occupation | Birthplace | Census | Address | Reference | Source | Other Information |
| Illard | Edmund | | | | | Cork | 1851 | | | for Part 1 of Weymouth and Melcome Regis, Dorset | |
| Ingram | Robert | | | 11 | | Galway, Ireland | 1881 | On Humber Training Ship 'Southampton' in Victoria Dock, hull | RG11-4756 Drypool 22 | | |
| Inslip | Bridget | | | | | Ireland | 1851 | | | for Part 1 of Weymouth and Melcome Regis, Dorset | |
| Inutherey? | Catherine | Head | Widow | 68 | Pauper & Shoemakers Widow | Ireland | 1851 | Downing St., Bodmin, Cornwall | Folio No. 0445; Piece No: 1904 (Reg. District: Bodmin, Parish: Bodmin) | | |
| Irefram | Emma | Sv | Unmarried | 19 | Maid | Corsham, Wilts | 1851 | 16, Friar St., Reading | 1851 Census 40107 1692C Fol 298 Sch 28 Page 8 | | |
| Irvine | Catherine | Daughter | | 5 | | Ireland | 1851 | Berwick, Northumberland | HO 107/2421 Folio 523 | | |
| Irvine | Henry | Head | | 30 | Labourer | Ireland | 1851 | Berwick, Northumberland | HO 107/2421 Folio 523 | | |
| Irvine | Mary | Wife | | 28 | | Ireland | 1851 | Berwick, Northumberland | HO 107/2421 Folio 523 | | |
| Irving | | | | | | Belfast | 1881 | Gt. Grimsby, Lincs | RG/3269 folio 14 | | |
| Irw(v)ine | John | | | 44 | Private in Regt 89th Foot | Ireland (B c 1805) | 1849 | (Out-pensioner of the Chelsea Hospital) | | Red River Census, Canada, 1849, per Family Tree Mag June 1989 | |
| Irwin | Katheline | | Unmarried | 22 | | County Down | 1881 | Weymouth, Dorset | RG11/2105 Folio 108 | | |
| Irwin | Margaret | Wife of Wm. | | 30 | | Ireland | 1881 | | | | |
| Irwin | William | | | 40 | | Ireland | 1881 | Kimmeridge, Dorset | Folio 78 Pg 2 | | |
| Ivory | Thomas | Visitor (head fanny jones) | | 30 | Glass Maker | Ireland | 1851 | Dartmouth St. 3 House,2 Court, Aston, Birmingham | Sch. 21 Page 1221 PRO Ref HO/107/2061/Reel 23 | | |