1851 Census - surnames beginning with U
| Last Name | First Name | Age | Parish | Piece | Folio | Page |
| UNDERWOOD | Margaret | 36 | Castletown | 2526 | 120 | 71 |
| UNDERWOOD | Thomas | 45 | Castletown | 2526 | 120 | 71 |
| UNKNOWN | Mary | 8 | Ballaugh | 2523 | 370 | 39 |
| UNSWORTH | Ellinor | 22 | Douglas | 2525 | 161 | 20 |
| UNSWORTH | George W. | 2 | Douglas | 2525 | 240 | 196 |
| UNSWORTH | Margaret | 27 | Douglas | 2525 | 240 | 196 |
| UNSWORTH | Margaret J. | 1 mon | Douglas | 2525 | 240 | 196 |
| UNSWORTH | Thomas A. | 30 | Douglas | 2525 | 240 | 196 |
| UPTON | Elizabeth | 31 | Rushen | 2526 | 292 | 102 |
| UPTON | Samuel | 2 | Rushen | 2526 | 292 | 102 |
| UPTON | Thomas | 33 | Rushen | 2526 | 292 | 102 |
| URIN | Charlotte | 20 | Malew | 2526 | 29 | 75 |
| URIN | Edmond | 32 | Malew | 2526 | 29 | 75 |
| URIN | Edmond | 10 wks | Malew | 2526 | 29 | 75 |
| URIN | Mary Jane | 18 mos | Malew | 2526 | 29 | 75 |