Teams
| Team | Nationality | Seasons |
|---|---|---|
| Athlone Town |  Ireland | 9 |
| Bohemian FC | Ireland | 20 |
| Bray Wanderers | Ireland | 18 |
| Cabinteely FC | Ireland | 7 |
| Cobh Ramblers | Ireland | 10 |
| Cork City | Ireland | 18 |
| Derry City | Ireland | 19 |
| Drogheda United | Ireland | 20 |
| Dublin City FC | Ireland | 1 |
| Dundalk FC | Ireland | 14 |
| Finn Harps | Ireland | 11 |
| Galway United | Ireland | 9 |
| Galway United (old) | Ireland | 5 |
| Limerick FC | Ireland | 7 |
| Longford Town | Ireland | 14 |
| Shamrock Rovers | Ireland | 20 |
| Shamrock Rovers II | Ireland | 1 |
| Shelbourne FC | Ireland | 15 |
| Sligo Rovers | Ireland | 17 |
| Sporting Fingal | Ireland | 1 |
| St Patrick's Athletic | Ireland | 20 |
| Treaty United | Ireland | 2 |
| UC Dublin | Ireland | 18 |
| Waterford FC | Ireland | 6 |
| Waterford United | Ireland | 8 |
| Wexford FC | Ireland | 6 |
| Wexford Youths | Ireland | 3 |