| Salterstown | Baile an tSalainn | Townland | | C | 1851 | L | 2003 |
| Salterstown | Baile an tSalainn | Civil Parish | | C | 1851 | L | 2003 |
| Sand Hole | | | Townparks (Dundalk) | GV | 1854 | | |
| Sandfield | Achadh an Ghainimh | Townland | | C | 1851 | L | 2003 |
| Sandyford Alley | | | Yellowbatter | GV | 1851 | | |
| Sandyford's Alley | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Scarlet Street | | | Yellowbatter | GV | 1854 | | |
| Scarlet Street | | | Yellowbatter | GV | 1851 | | |
| Scarlet Street | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Scholes Lane | | | Moneymore (Drogheda town) | T | 1886 | | |
| Schole's Lane | | | Moneymore | GV | 1851 | | |
| Scogganstown | Baile Scogan | Townland | | C | 1851 | L | 2003 |
| Scogginstown | | | Scogganstown | TAB(A) | 1830? | | |
| Scotch Hall | | | Lagavooren | GV | 1851 | | |
| Scotch Hall | | | Lagavooren (Drogheda Town) | T | 1886 | | |
| Seabank | | | Castlebellingham | FWS | 1908 | | |
| Seatown | | | Townparks (Dundalk) | GV | 1854 | | |
| Seatown Place | | | Townparks (Dundalk) | GV | 1854 | | |
| Seecrin | Suí Croinn | Townland | | C | 1851 | L | 2003 |
| Seefin | | | Annaloughan and Rampark | FWS | 1908 | | |
| Seinte Lenes Lane | | | Moneymore and Yellowbatter (Bachelor's Lane) | JB | 1997 | | |
| Serrelston | | | Charlestown (?) | FWS | 1908 | | |
| Shamrock, The | | | Greenmount | PSE | 1938 | | |
| Shamrockhill | Cnoc na Seamar | Townland | | C | 1851 | L | 2003 |
| Shankill | | | Grange, Irish | FWS | 1908 | | |
| Shanlis | An Seanlios | Townland | | C | 1851 | L | 2003 |
| Shanlis (2 parts) | An Seanlios | Civil Parish | | C | 1851 | L | 2003 |
| Shanmullagh | An Seanmhullach | Townland | | C | 1851 | L | 2003 |
| Sheelagh | Saileogach | Townland | | C | 1851 | L | 2003 |
| Sheepgrange | Gráinseach na gCaorach | Townland | | C | 1851 | L | 2003 |
| Sheepwalk | Clochán na gCaorach | Townland | | C | 1851 | L | 2003 |
| Sheetland | | | Termonfeckin | FWS | 1908 | | |
| Shereleston | | | Charlestown | FWS | 1908 | | |
| Sheskan | | | Ballymakellett | FWS | 1908 | | |
| Shiel's Court | | | Townparks (Dundalk) | GV | 1854 | | |
| Ship Street | | | Lagavooren | GV | 1851 | | |
| Ship Street | | | Lagavooren (Drogheda Town) | T | 1886 | | |
| Shop Street | | | Moneymore | GV | 1851 | | |
| Shop Street | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Shop Street | | | Moneymore (Drogheda town) | T | 1886 | | |
| Shore Road | | | Point | GV | 1854 | | |
| Shortstone, East | An Chloch Ghearr Uachtarach | Townland | | C | 1851 | L | 2003 |
| Shortstone, West | An Chloch Ghearr Íochtarach | Townland | | C | 1851 | L | 2003 |
| Silloge | An tSaileog | Townland | | C | 1851 | L | 2003 |
| Silverfield, The | | | Williamstown | PSE | 1938 | | |
| Silver Hill | | | Boharnamoe | FWS | 1908 | | |
| Silver Park | | | Louth Hall | FWS | 1908 | | |
| Simcock's Lane | | | Moneymore | GV | 1851 | | |
| Simcock's Lane | | | Mell | GV | 1851 | | |
| Simcock's Lane | | | Moneymore (Drogheda town) | T | 1886 | | |
| Simonstown | Baile Shíomóin | Townland | | C | 1851 | L | 2003 |
| Sionhouse | | | Stonehouse | FWS | 1908 | | |
| Skeaghmore | An Sceitheog Mhór | Townland | | C | 1851 | L | 2003 |
| Skeeg, The | | | Greenmount | PSE | 1938 | | |
| Skibbolmore | An Scioból Mór | Townland | | C | 1851 | L | 2003 |
| Slang, The | | | Bolies | PSE | 1938 | | |
| Slate Hills | | | Newtown, Monasterboice | FWS | 1908 | | |
| Slieve | An Mhuinchille | Townland | | C | 1851 | L | 2003 |
| Slieve Feede | | | Feede | FWS | 1908 | | |
| Slieveboy | An Sliabh Buí | Townland | | C | 1851 | L | 2003 |
| Slievenaglogh | Sliabh na gCloch | Townland | | C | 1851 | L | 2003 |
| Slieveroe | | | Bellurgan | FWS | 1908 | | |
| Slievestucan | | | Ballymakellett | FWS | 1908 | | |
| Sliganstown | | | Roxborough | FWS | 1908 | | |
| Smarmore | Smearamair | Townland | | C | 1851 | L | 2003 |
| Smarmore | Smearamair | Civil Parish | | C | 1851 | L | 2003 |
| Smoothing Iron | | | Greenmount | PSE | 1938 | | |
| South Quay | | | Lagavooren | GV | 1851 | | |
| South Quay | | | Lagavooren (Drogheda Town) | T | 1886 | | |
| Spellickanee | Speilg an Fhiaigh | Townland | | C | 1851 | L | 2003 |
| Split Rock, The | | | Glenmore | FWS | 1908 | | |
| Sportsman's Hall | | | Sportsmanshall | GV | 1854 | | |
| Sportsmanshall | Halla na Croiche | Townland | | C | 1851 | L | 2003 |
| Srath | | | Bolies | PSE | 1938 | | |
| Sravuroo | | | Williamstown | PSE | 1938 | | |
| St. Elena's Well, Lane to | | | Moneymore and Yellowbatter (Bachelor's Lane) | JB | 1997 | | |
| St Francis Street | | | Yellowbatter | GV | 1851 | | |
| St. James' Street | | | Lagavooren (James Street) | JB | 1997 | | |
| St Lawrence Street | | | Moneymore | GV | 1851 | | |
| St Magdalene Street | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| St Magdalene Street | | | Moneymore (Drogheda town) | T | 1886 | | |
| St Mary's, Drogheda | Paróiste Mhuire | Civil Parish | | C | 1851 | L | 2003 |
| St Peter's Street | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| St Peter's Street | | | Moneymore (Drogheda town) | T | 1886 | | |
| St. Peter's Street | | | Moneymore (Peter Street) | JB | 1997 | | |
| St Peter's, Drogheda | Paróiste Pheadair | Civil Parish | | C | 1851 | L | 2003 |
| St. James' | | | Lagavooren | GV | 1851 | | |
| St. Laurence Street | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Stabannan | Tigh Beannáin | Townland | | C | 1851 | L | 2003 |
| Stabannan | Tigh Beannáin | Civil Parish | | C | 1851 | L | 2003 |
| Stanage's Row | | | Moneymore | GV | 1851 | | |
| Stanage's Row | | | Moneymore (Drogheda town) | T | 1886 | | |
| Stapleton Place | | | Townparks (Dundalk) | GV | 1854 | | |
| Steam Packet Quay | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Stephenstown | Baile Lias | Townland | | C | 1851 | L | 2003 |
| Stickillin | Tigh Cillín | Townland | | C | 1851 | L | 2003 |
| Stickillin | Tigh Cillín | Civil Parish | | C | 1851 | L | 2003 |
| Stifyans | Tigh Phaghain | Townland | | C | 1851 | L | 2003 |
| Stirue | Tigh Rú | Townland | | C | 1851 | L | 2003 |
| Stirue | | Townland | | C | 1851 | | |
| Stockwell Lane | | | Moneymore | GV | 1851 | | |
| Stockwell Lane | | | Moneymore (Drogheda town) | T | 1886 | | |
| Stonehouse | Stónús | Townland | | C | 1851 | L | 2003 |
| Stonetown, Lower | Baile na Cloiche Íochtarach | Townland | | C | 1851 | L | 2003 |
| Stonetown, Upper | Baile na Cloiche Uachtarach | Townland | | C | 1851 | L | 2003 |
| Stonylane | Bóthar na gCloch | Townland | | C | 1851 | L | 2003 |
| Stonylane | | | Stonylane | TAB(A) | 1830? | | |
| Stormanstown | Baile an Aird | Townland | | C | 1851 | L | 2003 |
| Stranacarry | Srath na Coradh | Townland | | C | 1851 | L | 2003 |
| Strandfield | | | Navan | FWS | 1908 | | |
| Stranger's Gate | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Streamstown | Baile an tSrutháin | Townland | | C | 1851 | L | 2003 |
| Stumpa | An Stumpa | Townland | | C | 1851 | L | 2003 |
| Summerhill | Mullach Oscair | Townland | | C | 1851 | L | 2003 |
| Sunday Gate | | | Yellowbatter (Drogheda Town) | T | 1886 | | |
| Sunday Gate | | | Moneymore (Drogheda town) | T | 1886 | | |
| Sunday's Gate | | | Moneymore | GV | 1851 | | |
| Suntown | | | Ballynagrena | FWS | 1908 | | |
| Swinestown | Baile Mhac Suibhne | Townland | | C | 1851 | L | 2003 |
