| Dairy Hill | | | Point | GV | 1854 | | |
| Dale, The | | | Lagavooren | GV | 1851 | | |
| Dale, The | | | Lagavooren (Drogheda Town) | T | 1886 | | |
| Dales | Dalas | Townland | | C | 1851 | L | 2003 |
| Dardisrath | Ráth an Dairdisigh | Townland | | C | 1851 | L | 2003 |
| Darver | Dairbhre | Townland | | C | 1851 | L | 2003 |
| Darver | Dairbhre | Civil Parish | | C | 1851 | L | 2003 |
| Dawson's Demesne | Diméin an Dásanaigh | Townland | | C | 1851 | L | 2003 |
| Dawsons Demesne | | | Dawson's Demesne | TAB(A) | 1830? | | |
| Dawsonsdemesne | | | Dawson's Demesne | GV | 1854 | | |
| Deerpark | Páirc na bhFia | Townland | | C | 1851 | L | 2003 |
| Deerparks | | | Lisnawully | FWS | 1908 | | |
| Dellin | Deilinn | Townland | | C | 1851 | L | 2003 |
| Demesne | An Diméin | Townland | | C | 1851 | L | 2003 |
| Derrycammagh | Doire Chamach | Townland | | C | 1851 | L | 2003 |
| Derryfalone | Doire Mhaoileoin | Townland | | C | 1851 | L | 2003 |
| Diccomall | | | Derrycammagh | FWS | 1908 | | |
| Dillonstown | Baile an Diolúnaigh | Townland | | C | 1851 | L | 2003 |
| Distillery Lane | | | Townparks (Dundalk) | GV | 1854 | | |
| Dominick Lane | | | Moneymore | GV | 1851 | | |
| Dominick Street | | | Moneymore (Drogheda town) | T | 1886 | | |
| Donaghmore | An Domhnach Mór | Townland | | C | 1851 | L | 2003 |
| Dondogin | | | Commons (?) (Dromiskin Civil Parish) | FWS | 1908 | | |
| Donmoghan | | | Dunmahon | FWS | 1908 | | |
| Donnellystown | Baile Ui Dhonnaíle | Townland | | C | 1851 | L | 2003 |
| Donreaghan | | | Mullatee | FWS | 1908 | | |
| Doolargy | An Dúleargaidh | Townland | | C | 1851 | L | 2003 |
| Doonan | | | Dulargy | FWS | 1908 | | |
| Dowdalls Hill Village | | | Dowdallshill | GV | 1854 | | |
| Dowdallshill | Mullach an Dúdálaigh | Townland | | C | 1851 | L | 2003 |
| Dowdstown | Baile an Dódaigh | Townland | | C | 1851 | L | 2003 |
| Draghanstown | Baile Dharcháin | Townland | | C | 1851 | L | 2003 |
| Drakestown | Baile an Drácaigh | Townland | | C | 1851 | L | 2003 |
| Dredro | | | Philipstown (Ardee Barony) | FWS | 1908 | | |
| DROGHEDA | Droichead Átha | Barony | | C | 1851 | L | 2003 |
| DROGHEDA BOROUGH | | Borough | | C | 1851 | | |
| Drogheda Borough | | | Ballsgrove | GV | 1854 | | |
| Drogheda Borough | | | Lagavooren | GV | 1851 | | |
| Drogheda Borough | | | Moneymore | GV | 1851 | | |
| Drogheda Borough | | | Yellowbatter | GV | 1851 | | |
| Drogheda Borough | | | Mell | GV | 1851 | | |
| Drogheda Road | | | Townparks (Ardee) | GV | 1854 | | |
| Drogheda Street | | | Collon | GV | 1854 | | |
| Droghedayarry Bridge | | | Tullakeel | FWS | 1908 | | |
| Dromgoolestown | Droim Gabhail | Townland | | C | 1851 | L | 2003 |
| Dromin | Droim Ing | Townland | | C | 1851 | L | 2003 |
| Dromin | Droim Ing | Civil Parish | | C | 1851 | L | 2003 |
| Dromiskin | Droim Ineasclainn | Townland | | C | 1851 | L | 2003 |
| Dromiskin | Droim Ineasclainn | Civil Parish | | C | 1851 | L | 2003 |
| Dromiskin Village | | | Dromiskin | GV | 1854 | | |
| Drumad | Droim Fhada | Townland | | C | 1851 | L | 2003 |
| Drumard | An Droim Ard | Townland | | C | 1851 | L | 2003 |
| Drumbilla | Droim Bile | Townland | | C | 1851 | L | 2003 |
| Drumboe | | | Belpatrick | FWS | 1908 | | |
| Drumcah | Droim Chatha | Townland | | C | 1851 | L | 2003 |
| Drumcah | | | Greenmount | FWS | 1908 | | |
| Drumcamill | Droim Chamhaoil | Townland | | C | 1851 | L | 2003 |
| Drumcar | Droim Chora | Townland | | C | 1851 | L | 2003 |
| Drumcar | Droim Chora | Civil Parish | | C | 1851 | L | 2003 |
| Drumcashel | Droim Chaisil | Townland | | C | 1851 | L | 2003 |
| Drumeenagh | | | Bellurgan | FWS | 1908 | | |
| Drumgonnelly | Droim Dhonnaíle | Townland | | C | 1851 | L | 2003 |
| Drumgoolan | Droim Gualann | Townland | | C | 1851 | L | 2003 |
| Drumgoolestown | | | Dromgoolestown | GV | 1854 | | |
| Drumgooter | Droim Gúitir | Townland | | C | 1851 | L | 2003 |
| Drumgowan | | | Crowmartin | FWS | 1908 | | |
| Drumgowna | Droim Gamhna | Townland | | C | 1851 | L | 2003 |
| Drumgur | Droim gCorr | Townland | | C | 1851 | L | 2003 |
| Drumhirk | | | Greatwood | FWS | 1908 | | |
| Drumin Civil Parish of Dunleer) | An Dromainn | Townland | | C | 1851 | L | 2003 |
| Drumin (Civil Parish of Dysart) | An Dromainn | Townland | | C | 1851 | L | 2003 |
| Drumleck (Civil Parish of Dromiskin) | Droim Leice | Townland | | C | 1851 | L | 2003 |
| Drumleck (Civil Parish of Gernonstown) | | Townland | | C | 1851 | L | 2003 |
| Drummeenagh | Droimíneach | Townland | | C | 1851 | L | 2003 |
| Drummorcher | | | Philipstown (Dundalk Barony) | FWS | 1908 | | |
| Drummuckavall Lough | | | Rassan and Courtbane | FWS | 1908 | | |
| Drummullagh | Droim Mullaigh | Townland | | C | 1851 | L | 2003 |
| Drummury | | | Drumgur (?) | FWS | 1908 | | |
| Drumnacarra | Droim na Cora | Townland | | C | 1851 | L | 2003 |
| Drumnasillagh | Droim na Saileach | Townland | | C | 1851 | L | 2003 |
| Drumshallon | Droim Sealann | Townland | | C | 1851 | L | 2003 |
| Drumshallon (2 parts) | Droim Sealann | Civil Parish | | C | 1851 | L | 2003 |
| Drumsinnot | Droim Seanaid | Townland | | C | 1851 | L | 2003 |
| Drumurvey | | | Drumgur (?) | FWS | 1908 | | |
| Dublin Road | | | Lagavooren | GV | 1851 | | |
| Dublin Road | | | Lagavooren (Drogheda Town) | T | 1886 | | |
| Dublin Street | | | Townparks (Dundalk) | GV | 1854 | | |
| Ducavan | Dúchabhán | Townland | | C | 1851 | L | 2003 |
| Duddestown | | | Port | FWS | 1908 | | |
| Duffsfarm | Feirm Dhuibh | Townland | | C | 1851 | L | 2003 |
| Duffy's Cross | | | Gilbertstown (?) | FWS | 1908 | | |
| Duke Street | | | Moneymore | GV | 1851 | | |
| Duke Street | | | Moneymore (Drogheda town) | T | 1886 | | |
| Duleek Gate | | | Lagavooren | GV | 1851 | | |
| Duleek Gate | | | Lagavooren (Drogheda Town) | T | 1886 | | |
| Duleek Street | | | Lagavooren (Drogheda Town) | T | 1886 | | |
| Dunany | Dún Áine | Townland | | C | 1851 | L | 2003 |
| Dunany | Dún Áine | Civil Parish | | C | 1851 | L | 2003 |
| Dunbin | Dún Binne | Civil Parish | | C | 1851 | L | 2003 |
| Dunbin Big | Dún Binne Mór | Townland | | C | 1851 | L | 2003 |
| Dunbin Little | Dún Binne Beag | Townland | | C | 1851 | L | 2003 |
| Dundalk | Dún Dealgan | Civil Parish | | C | 1851 | L | 2003 |
| Dundalk Borough | | | Townparks (Dundalk) | GV | 1854 | | |
| Dundalk Borough | | | Point | GV | 1854 | | |
| Dundalk Street | | | Liberties of Carlingford | GV | 1854 | | |
| Dundalk Street (old road) | | | Commons (Carlingford) | GV | 1854 | | |
| DUNDALK, LOWER | Dún Dealgan Íochtarach | Barony | | C | 1851 | L | 2003 |
| DUNDALK, UPPER | Dún Dealgan Uachtarach | Barony | | C | 1851 | L | 2003 |
| Dunduggan | | | Commons (?) (Dromiskin) | FWS | 1908 | | |
| Dunelly Lough | | | Essexford | FWS | 1908 | | |
| Dungogin | | | Commons (?) (Dromiskin Civil Parish) | FWS | 1908 | | |
| Dungooly | Dún gCuaille | Townland | | C | 1851 | L | 2003 |
| Dunleer | Dún Léire | Townland | | C | 1851 | L | 2003 |
| Dunleer | Dún Léire | Civil Parish | | C | 1851 | L | 2003 |
| Dunleer Town | | | Dunleer | GV | 1854 | | |
| Dunmahon | Dún Machan | Townland | | C | 1851 | L | 2003 |
| Dunmore | | | Belpatrick | FWS | 1908 | | |
| Dunn's Fort | | | Drumnasillagh | FWS | 1908 | | |
| Durnin's Lough | | | Cloghanmoyle and Tullakeel | FWS | 1908 | | |
| Duryhole | Poll an Diúraidh | Townland | | C | 1851 | L | 2003 |
| Dyer Street | | | Moneymore | GV | 1851 | | |
| Dyer Street | | | Moneymore (Drogheda town) | T | 1886 | | |
| Dyer Strete | | | Moneymore (Dyer Street) | JB | 1997 | | |
| Dyrryston | | | Carstown (?) | FWS | 1908 | | |
| Dysart | An Díseart | Townland | | C | 1851 | L | 2003 |
| Dysart | An Díseart | Civil Parish | | C | 1851 | L | 2003 |
