| Antrim: | 476 | Armagh: | 136 | Belfast city: | 197 | Carlow: | 8 |
| Cavan: | 30 | Clare: | 7 | Cork: | 13 | Cork city: | 17 |
| Derry: | 201 | Donegal: | 140 | Down: | 396 | Dublin: | 55 |
| Dublin city: | 55 | Fermanagh: | 152 | Galway: | 18 | Kerry: | 30 |
| Kildare: | 18 | Kilkenny: | 15 | Laois: | 84 | Leitrim: | 27 |
| Limerick: | 4 | Limerick city: | 4 | Longford: | 65 | Louth: | 29 |
| Mayo: | 33 | Meath: | 30 | Monaghan: | 90 | Offaly: | 14 |
| Roscommon: | 11 | Sligo: | 17 | Tipperary: | 33 | Tyrone: | 132 |
| Waterford: | 38 | Westmeath: | 6 | Wexford: | 17 | Wicklow: | 16 |
| Mac Tomáis | Thomson: líonmhar: an Dún & rl. Albanaigh arís. |
| Thompson | Very numerous: all areas, especially Ulster, Dublin, South East. One of the most numerous non-indigenous names, usually of English origin. |
| Thomson | numerous: Belfast area, Down etc. Scottish. |
Parishes where Thompson and a second surname are found together
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