| Place | Post Code |
|---|---|
| An Bóthar Ard (Boherard, Killallon) | C15 |
| Cloneveran, Killallon | C15 |
| Clongowny, Killallon | A82 |
| Ráistín (Clonmellon, Killallon) | C15 |
| Dunnagorran, Killallon | A82 |
| Galboystown, Killallon | C15 |
| Baile an Hartaigh (Hartstown, Killallon) | A82, C15 |
| Killacroy, Killallon | C15 |
| Coill Fhallúin (Killallon, Killallon) | A82, C15, C15 |
| Sliabh an Rí (Kingsmountain, Killallon) | A82, N91 |
| Lordstown, Killallon | A82 |
| Loughanbrean, Killallon | A82 |
| Loughanderg, Killallon | A82 |
| Baile an Mhuilinn (Milltown, Killallon) | C15 |
| An Baile Nua (Newtown, Killallon) | A82 |
| Rathbrack, Killallon | C15 |
| Seraghstown, Killallon | A82 |
| Seanchua (Shanco, Killallon) | A82 |
| Stirrupstown, Killallon | A82 |
| Stranaboll, Killallon | C15 |