By ship name
| Ship | Year | Origin | Destination |
| MACEDONIA | 1834 | Londonderry | Philadelphia |
| MAINE | 1826 | Ireland | Maine |
| MALABAR | 1851 | Dublin | New York |
| MANHATTAN | 1867 | Queenstown | New York |
| MANHATTAN | 1868 | Queenstown | New York |
| MANHATTAN | 1934 | Queenstown | New York |
| MARCHIONESS | 1845 | Londonderry | New Orleans |
| MARCHIONESS OF ABERCORN | 1840 | Londonderry | Wilmington |
| MARCHIONESS OF BUTE | 1850 | Newry | New York |
| MARCHIONESS OF CLYDESDALE | 1852 | Glasgow (Greenock) | New York |
| MARGARET | 1803 | Newry | New York |
| MARGARET | 1803 | Newry | New York |
| MARGARET | 1803 | Newry | New York |
| MARGARET | 1816 | Sligo | New York |
| MARGARET BALFOUR | 1835 | Belfast | Baltimore |
| MARIA | 1849 | Belfast | New York |
| MARIA | 1850 | Belfast | Philadelphia |
| MARIA DUPLEX | 1811 | Belfast | New York |
| MARIE OF WILMINGTON | 1804 | Londonderry | Philadelphia |
| MARINER | 1811 | Londonderry | New London |
| MARMION | 1825 | Londonderry | New York |
| MARMION | 1826 | Liverpool | Philadelphia |
| MARS | 1803 | Dublin | [unspecified] |
| MARS | 1803 | Dublin | [unspecified] |
| MARS | 1803 | Dublin | [unspecified] |
| MARTHA | 1851 | Galway | New York |
| MARTHA WASHINGTON | 1845 | Liverpool | New Orleans |
| MARY | 1804 | Dublin | Philadelphia |
| MARY | 1811 | Londonderry | Philadelphia |
| MARY | 1820 | Coleraine | Charleston |
| MARY | 1847 | Cork | Boston |
| MARY CUMMINGS | 1833 | Londonderry | Wilmington |
| MARY JANE | 1847 | Westport | Baltimore |
| MARY PRINGE | 1847 | Limerick | Baltimore |
| MARY WELLINGTON | 1811 | Londonderry | Philadelphia |
| MECHANIC | 1804 | Dublin | Baltimore |
| MEDFORD | 1820 | Cork | Baltimore |
| MEDFORD | 1820 | Cork | Baltimore |
| METAGAMA | 1923 | Belfast | Quebec |
| METOKA | 1847 | Roscommon | New York |
| MIAMI | 1851 | Tralee | New York |
| MILICETE | 1846 | Liverpool | New York |
| MILLICETE | 1852 | Dublin | New York |
| MILTIADES | 1845 | Belfast | New Orleans |
| MINERVA | 1850 | Londonderry | Philadelphia |
| MINNESOTA | 1867 | Queenstown | New York |
| MINNESOTA | 1868 | Queenstown | New York |
| MINNESOTA | 1869 | Queenstown | New York |
| MINNESOTA | 1869 | Queenstown | New York |
| MINNESOTA | 1870 | Queenstown | New York |
| MINNIHAHA | 1863 | Londonderry | New York |
| MINSTREL BOY | 1831 | [unspecified] | Wilmington |
| MIRAMICHI | 1851 | Belfast | New York |
| MISSISSIPPI | 1849 | Cork | Baltimore |
| MISSISSIPPI | 1851 | Cork | New York |
| MOHAWK | 1803 | Londonderry | Philadelphia |
| MOHAWK | 1803 | Londonderry | Philadelphia |
| MONAPIA | 1851 | Wexford | New York |
| MONTANA | 1877 | Queenstown | New York |
| MONTANA | 1878 | Queenstown | New York |
| MONTANA | 1878 | Queenstown | New York |
| MONTANA | 1879 | Queenstown | New York |
| MULGRAVE CASTLE | 1833 | Belfast | Wilmington |
| MUNROE | 1825 | Galway | New York |