| Paddock | An Peadac | Townland | | C | 1851 | L | 2003 |
| Paddo's Acre | | | Williamstown | PSE | 1938 | | |
| Painestown (Civil Parish of Clonmore) | Baile Phaghain | Townland | | C | 1851 | L | 2003 |
| Painestown (Civil Parish of Dromin) | Baile Phaghain | Townland | | C | 1851 | L | 2003 |
| Páirca Dán | | | Greenmount | PSE | 1938 | | |
| Pakenham Hall | | | Muff | FWS | 1908 | | |
| Palace Road | | | Moneymore | GV | 1851 | | |
| Palace Row | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Palace Street | | | Moneymore | GV | 1851 | | |
| Palace Street | | | Yellowbatter | GV | 1851 | | |
| Palace Street | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Palmersland | Talamh Falmaireach | Townland | | C | 1851 | L | 2003 |
| Para Bwee's Cross | | | Christianstown | FWS | 1908 | | |
| Paradise Row | | | Moneymore | GV | 1851 | | |
| Paradise Row | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Park Street | | | Townparks (Dundalk) | GV | 1854 | | |
| Parkelowine | | | Carrickedmond (?) | FWS | 1908 | | |
| Parklorne | | | Carrickedmond (?) | FWS | 1908 | | |
| Parliament Square | | | Townparks (Dundalk) | FWS | 1908 | | |
| Parnagasta's House | | | Jenkinstown | FWS | 1908 | | |
| Parsonstown | Baile an Phearsúin | Townland | | C | 1851 | L | 2003 |
| Parsonstown | Baile an Phearsúin | Civil Parish | | C | 1851 | L | 2003 |
| Patrick Street | | | Moneymore | GV | 1851 | | |
| Patrick's Well Lane | | | Moneymore (Drogheda town) | T | 1886 | | |
| Paughanstown (Civil Parish of Dromin) | Baile Phochain | Townland | | C | 1851 | L | 2003 |
| Paughanstown (Civil Parish of Kildermock) | Baile Phochain | Townland | | C | 1851 | L | 2003 |
| Pepperstown | Baile an Phiobaraigh | Townland | | C | 1851 | L | 2003 |
| Peter 's Court | | | Moneymore (Drogheda town) | T | 1886 | | |
| Peter Street | | | Moneymore | GV | 1851 | | |
| Petestown | Baile Pheití | Townland | | C | 1851 | L | 2003 |
| Philibenstown | Baile na bhFilibíneach | Townland | | C | 1851 | L | 2003 |
| Philipston Kenrick | | | Philipstown (?) (Ardee Barony) | FWS | 1908 | | |
| Philipstown (Civil Parish of Mosstown) | Baile Philib | Townland | | C | 1851 | L | 2003 |
| Philipstown (Civil Parish of Philipstown, Barony of Ardee) | Baile Philib | Townland | | C | 1851 | L | 2003 |
| Philipstown (Civil Parish of Philipstown, Barony of Dundalk) | Baile Philib | Townland | | C | 1851 | L | 2003 |
| Philipstown (Civil Parish of Philipstown, Barony of Ferrard) | Baile Philib | Townland | | C | 1851 | L | 2003 |
| Philipstown (Barony of Ardee) | Baile Philib | Civil Parish | | C | 1851 | L | 2003 |
| Philipstown (Barony of Dundalk) | Baile Philib | Civil Parish | | C | 1851 | L | 2003 |
| Philipstown (Barony of Ferrard) | Baile Philib | Civil Parish | | C | 1851 | L | 2003 |
| Piedmont | Baile Mhic Dhónaill | Townland | | C | 1851 | L | 2003 |
| Piperstown | Baile an Phiobaraigh | Townland | | C | 1851 | | |
| Pitcher Hill | | | Lagavooren | GV | 1851 | | |
| Pitcher Hill | | | Lagavooren (Drogheda Town) | T | 1886 | | |
| Plakatan | | | Lisrenny and Paughanstown | FWS | 1908 | | |
| Plaster (Civil Parish of Barronstown) | Plástar | Townland | | C | 1851 | L | 2003 |
| Plaster (Civil Parish of Ballymascanlan) | Plástar | Townland | | C | 1851 | L | 2003 |
| Platin Road | | | Lagavooren | GV | 1851 | | |
| Platin Road | | | Lagavooren (Drogheda Town) | T | 1886 | | |
| Pleasure Hill | | | Newtown, Monasterboice | FWS | 1908 | | |
| Plunketsland | Talamh Pluincéadach | Townland | | C | 1851 | L | 2003 |
| Plunketsland | Fearann an Phluincéadaigh | Townland | | C | 1851 | L | 2003 |
| Point | An Pointe | Townland | | C | 1851 | L | 2003 |
| Pollbrock | Poll Broc | Townland | | C | 1851 | L | 2003 |
| Pollclabur | | | Dromin | FWS | 1908 | | |
| Pony Field | | | Haynestown (?) | M(n) | 1930 | | |
| Pookstown | | | Puckstown (?) | FWS | 1908 | | |
| Port | An Port | Townland | | C | 1851 | L | 2003 |
| Port | An Port | Civil Parish | | C | 1851 | L | 2003 |
| Port na Guinan | | | Slievenaglogh | FWS | 1908 | | |
| Potato Market Square | | | Moneymore | GV | 1851 | | |
| Potato Market Square | | | Moneymore (Drogheda town) | T | 1886 | | |
| Priest's Lane | | | Lagavooren | GV | 1851 | | |
| Priest's Lane | | | Lagavooren (Drogheda Town) | T | 1886 | | |
| Priest's Pad, The | | | Castletowncooley and Mullaghattin (?) | FWS | 1908 | | |
| Priest-town | Baile an tSagairt | Townland | | C | 1851 | L | 2003 |
| Primatepark | Talamh an Phríomháidh | Townland | | C | 1851 | L | 2003 |
| Primate's Wood | | | Dromiskin | FWS | 1908 | | |
| Priorland | Baile an Phrióra | Townland | | C | 1851 | L | 2003 |
| Priorstate | Dúiche na mBráthar | Townland | | C | 1851 | L | 2003 |
| Priorstown (Civil Parish of Drumshallom) | Baile an Phrióra | Townland | | C | 1851 | L | 2003 |
| Priorstown (Civil Parish of Termonfeckin) | Baile an Phrióra | Townland | | C | 1851 | L | 2003 |
| Proleek | Proilíg | Townland | | C | 1851 | L | 2003 |
| Proleek Acres | Acraí Phroilíg | Townland | | C | 1851 | L | 2003 |
| Prospect | | | Yellowbatter | GV | 1851 | | |
| Prospect Avenue | | | Yellowbatter | GV | 1851 | | |
| Prospect Avenue | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Prospect Road | | | Yellowbatter | GV | 1851 | | |
| Puckstown | Poll an Phúca | Townland | | C | 1851 | L | 2003 |
| Purcell's Court | | | Townparks (Dundalk) | GV | 1854 | | |
| Purcellstown | Baile Phursáid | Townland | | C | 1851 | L | 2003 |
| Purcheston | | | Purcellstown | FWS | 1908 | | |
