By ship name
| Ship | Year | Origin | Destination |
| PACIFIC | 1858 | Galway | New York |
| PACIFIC | 1858 | Galway | New York |
| PACIFIC | 1858 | Galway | New York |
| PANAMA | 1846 | Liverpool | New York |
| PARSEE | 1853 | [unspecified] | Australia (Moreton Bay) |
| PARTHIA | 1879 | Queenstown | New York |
| PATIENCE & JUDITH | 1716 | London | [unspecified] |
| PATTY | 1803 | Newry | [unspecified] |
| PAVONIA | 1883 | Queenstown | New York |
| PAVONIA | 1890 | Queenstown | Boston |
| PAVONIA | 1890 | Queenstown | Boston |
| PAVONIA | 1890 | Queenstown | Boston |
| PAVONIA | 1891 | Queenstown | Boston |
| PENNSYLVANIA | 1803 | Londonderry | Philadelphia |
| PENNSYLVANIA | 1803 | Londonderry | Philadelphia |
| PENNSYLVANIA | 1868 | Queenstown | New York |
| PERSEVERANCE | 1811 | Belfast | New York |
| PERSIA | 1867 | Queenstown | New York |
| PERSIA | 1868 | Queenstown | New York |
| PHARSALIA | 1845 | Liverpool | New Orleans |
| PHILAH | 1848 | Belfast | New York |
| PHOENIX | 1834 | Londonderry | Philadelphia |
| PLANTER | 1827 | Belfast | New Orleans |
| PORTLAND | 1803 | [unspecified] | Charleston |
| PORTLAND | 1803 | [unspecified] | Charleston |
| PRESIDENT | 1804 | Newry | New Castle |
| PRIMUS | 1851 | Galway | New York |
| PRINCE ALBERT | 1859 | Galway | New York |
| PRINCE ALBERT | 1861 | Galway | New York |
| PRINCE DE JOINVILLE | 1847 | Liverpool | New York |
| PRINCE LEOPOLD | 1820 | Belfast | Charleston |
| PRINCE LEOPOLD | 1820 | Belfast | Charleston |
| PRINCESS | 1851 | Dublin | New York |
| PRINCETON | 1853 | Liverpool | New York |
| PROGRESS | 1848 | Roscommon | New York |
| PROTECTION | 1811 | Belfast | New York |
| PRUDENCE | 1804 | Dublin | [unspecified] |
| PRUDENCE | 1832 | Londonderry | Philadelphia |