| NAME ▲ | ▼ | VESSEL ▲ | ▼ | RIG | YEAR ▲ | ▼ | AGE | MORE |
|
| John Underwood | Grand Turk | Ship | 1832 | 22 | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Grand Turk | Ship | 22 | 5' 7" | Dark | | | Hair | Eye | Residence | Rank | Remarks | | Brown | | Boston | | | | |
|
| John Underwood | Condor | Bark | 1831 | 21 | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Condor | Bark | 21 | 5' 7" | Dark | | | Hair | Eye | Residence | Rank | Remarks | | Brown | | Boston | | | | |
|
| John Uncas | Pacific | Schooner | 1842 | 24 | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Pacific | Schooner | 24 | 5' 8" | Dark | | | Hair | Eye | Residence | Rank | Remarks | | Black | | New London | | | | |
|
| John Uic | John and Winthrop | Bark | 1881 | 25 | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | John and Winthrop | Bark | 25 | 5' 8" | Dark | | | Hair | Eye | Residence | Rank | Remarks | | Dark | | Hessen, Germany | | | | |
|
| John Uhler? | Mount Wollaston | Ship | 1840 | 29 | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Mount Wollaston | Ship | 29 | 5' 11" | Dark | | | Hair | Eye | Residence | Rank | Remarks | | Dark | | Salem | | | | |
|
| John Uhgrove | Alice Mandell | Ship | 1855 | | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Alice Mandell | Ship | | | | | | Hair | Eye | Residence | Rank | Remarks | | | | | Blacksmith | | | |
|
| John Uban | Corinthian | Ship | 1843 | | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Corinthian | Ship | | | | | | Hair | Eye | Residence | Rank | Remarks | | | | | Mariner | | | |
|
| John Uban | Corinthian | Ship | 1843 | | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Corinthian | Ship | | | | | | Hair | Eye | Residence | Rank | Remarks | | | | | Mariner | | | |
|
| John U. Whitone | Wanderer | Bark | 1908 | 26 | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Wanderer | Bark | 26 | 5' 7" | White | | | Hair | Eye | Residence | Rank | Remarks | | Dark | | Boston, Ma | | | | |
|
| John U. Ricker | Benjamin Franklin | bark | 1858 | 23 | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Benjamin Franklin | bark | 23 | 5' 7" | light | | | Hair | Eye | Residence | Rank | Remarks | | sandy | | Great Falls | green hand | deserted at St. Helena, 8 Dec 1859 | | |
|
| John U. Mortz | Chandler Price | Ship | 1854 | | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Chandler Price | Ship | | | | | | Hair | Eye | Residence | Rank | Remarks | | | | | Greenhand | | | |
|
| John U. Berry | Superior | Bark | 1857 | 17 | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Superior | Bark | 17 | | Dark | | | Hair | Eye | Residence | Rank | Remarks | | Dark | | Summerville, Nh | | | | |
|
| John U. Bailey | Dryade | Brig | 1840 | 21 | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Dryade | Brig | 21 | | | | | Hair | Eye | Residence | Rank | Remarks | | | | Freetown | | | | |
|
| John Tyr? | Tampico | Brig | 1839 | 24 | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Tampico | Brig | 24 | 5' 8" | Light | | | Hair | Eye | Residence | Rank | Remarks | | Light | | Stonington | | | | |
|
| John Tyler | Trident | Ship | 1846 | | ⊕ |
| | | Vessel | Rig | Age | Height | Skin | | Trident | Ship | | | | | | Hair | Eye | Residence | Rank | Remarks | | | | | Boatsteerer | | | |
|
