1841 Census - surnames beginning with U
| Last Name | First Name | Age | Parish | Piece | Folio | Page |
| UMBOIS | Alfred | 18 mos | German | 1463/7 | 47 | 3 |
| UMBOIS | Charles | 30 | German | 1463/7 | 47 | 3 |
| UMBOIS | Maria | 23 | German | 1463/7 | 47 | 3 |
| UMBOIS | William | 5 | German | 1463/7 | 47 | 3 |
| UNDERWOOD | Catherine | 85 | Ramsey | 1464/8 | 10 | 13 |
| UNDERWOOD | John | 6 | Castletown | 1464/5 | 53 | 25 |
| UNDERWOOD | Margaret | 25 | Castletown | 1464/5 | 53 | 25 |
| UNDERWOOD | Thomas | 30 | Castletown | 1464/5 | 52 | 24 |
| UNDERWOOD | Thomas | 3 | Castletown | 1464/5 | 53 | 25 |
| . . Unreadable | Elizabeth | nk | Douglas | 1465/8 | 34 | 25 |
| UNSWORTH | Giber | 14 | Douglas | 1465/3 | 34 | 2 |
| UNSWORTH | James | 40 | Douglas | 1465/3 | 34 | 2 |
| UNWIN | Sarah | 20 | Santon | 1463/2 | 24 | 5 |
| UPSON | Mark | 20 | Castletown | 1464/5 | 65 | 3 |
| URCK | John | 50 | Douglas | 1465/5 | 14 | 24 |
| URCK | John | 14 | Douglas | 1465/5 | 14 | 24 |
| URCK | Margaret | 46 | Douglas | 1465/5 | 14 | 24 |
| USHER | Jane | 80 | Castletown | 1464/5 | 32 | 26 |