| Naginn Lough | | | Stormanstown (?) | FWS | 1908 | | |
| Navan | Nabhainn | Townland | | C | 1851 | L | 2003 |
| Nessmore | | | Ballinteskin | FWS | 1908 | | |
| New Field | | | Castlebellingham | M(n) | 1930 | | |
| New Quay | | | Moneymore | GV | 1851 | | |
| New Quay | | | Moneymore (Drogheda town) | T | 1886 | | |
| New Road | | | Lagavooren | GV | 1851 | | |
| New Row | | | Townparks (Dundalk) | GV | 1854 | | |
| Newhaggard | | | Haggardstown | FWS | 1908 | | |
| Newhall | An Halla Nua | Townland | | C | 1851 | L | 2003 |
| Newhouse | An Niús | Townland | | C | 1851 | L | 2003 |
| Newragh | An Iúrach | Townland | | C | 1851 | L | 2003 |
| Newrath (Civil Parish of Dromiskin) | An Iúrach | Townland | | C | 1851 | L | 2003 |
| Newrath (Civil Parish of Louth) | An Ráth Nua | Townland | | C | 1851 | L | 2003 |
| Newry Street | | | Liberties of Carlingford | GV | 1854 | | |
| Newtown (Civil Parish of Louth, Barony of Ardee)) | An Baile Úr | Townland | | C | 1851 | L | 2003 |
| Newtown (Civil Parish of Louth, Barony of Louth) | An Baile Úr | Townland | | C | 1851 | L | 2003 |
| Newtown (Civil Parish of Termonfeckin) | Baile Nua an Tearmainn | Townland | | C | 1851 | L | 2003 |
| Newtown Knockaleva | Baile Nua Chnoc an tSléibhe | Townland | | C | 1851 | L | 2003 |
| Newtown, Monasterboice | Baile Nua Mhainistir Bhuithe | Townland | | C | 1851 | L | 2003 |
| Newtownbabe | Baile Nua an Bhábaigh | Townland | | C | 1851 | L | 2003 |
| Newtownbalregan | Baile Nua Dealgan | Townland | | C | 1851 | L | 2003 |
| Newtowndarver | Baile Nua Dhairbhreach | Townland | | C | 1851 | L | 2003 |
| Newtownfane | Baile Nua Áth Féan | Townland | | C | 1851 | L | 2003 |
| Newtownstalaban (Civil Parish of Beaulieu) | Tigh Líobáin | Townland | | C | 1851 | L | 2003 |
| Newtownstalaban (detached) (Civil Parish of Tullyallen) | Tigh Líobáin | Townland | | C | 1851 | L | 2003 |
| Nicholas Street | | | Townparks (Dundalk) | GV | 1854 | | |
| Nicholastown (Civil Parish of Philipstown) | Baile Niocóil | Townland | | C | 1851 | L | 2003 |
| Nicholastown (Civil Parish of Port) | Baile Niocóil | Townland | | C | 1851 | L | 2003 |
| North Commons | | | Townparks? (Ardee) | TAB(A) | 1830? | | |
| North Gate, road to | | | Moneymore (Magdalene Street) | JB | 1997 | | |
| North Glebe | | | Glebe | TAB(A) | 1830? | | |
| North Quay | | | Moneymore | GV | 1851 | | |
| North Quay | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| North Road | | | Moneymore | GV | 1851 | | |
| North Road | | | Moneymore (Drogheda town) | T | 1886 | | |
| North Strand | | | Yellowbatter | GV | 1851 | | |
| North Strand | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Nun's Walk | | | Yellowbatter | GV | 1854 | | |
| Nun's Walk | | | Yellowbatter | GV | 1851 | | |
| Nun's walk | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Nurlestown | | | Hurlstone (?) | FWS | 1908 | | |
