| Antrim: | 11 | Armagh: | 2 | Belfast city: | 5 | Cavan: | 1 |
| Clare: | 4 | Derry: | 3 | Donegal: | 1 | Down: | 14 |
| Dublin: | 1 | Dublin city: | 2 | Fermanagh: | 28 | Galway: | 2 |
| Kerry: | 2 | Kildare: | 1 | Leitrim: | 1 | Meath: | 1 |
| Monaghan: | 2 | Offaly: | 2 | Tyrone: | 1 |
| Johnston | Very numerous: all areas, especially Ulster, corresponding to its prevalence in Scotland. This is a case where a landlord gave his name (John) to a place in Dumfriesshire. SS. |
| Johnstone | fairly numerous: Ulster & Dublin. As Johnston. |
Parishes where Johnstone and a second surname are found together
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