| Armagh: | 1 | Cavan: | 6 | Derry: | 2 | Dublin: | 6 |
| Dublin city: | 3 | Fermanagh: | 1 | Galway: | 1 | Kildare: | 1 |
| Leitrim: | 10 | Limerick city: | 1 | Longford: | 14 | Meath: | 1 |
| Monaghan: | 2 | Offaly: | 1 | Roscommon: | 5 | Tyrone: | 2 |
| Westmeath: | 1 | Wexford: | 2 |
| MacGeown | numerous: Armagh-Down-Tyrone-Antrim- Monaghan-Louth. Ir. Mag Eoghain. From first name Eoghan. See also Mac Keown. |
| MacKeon | numerous: all areas, especially Midlands & Connacht. Ir. Mac Eoghain, from old first name Eoghan (yew-born), or Mac Eoin (John). See Mac Keown. |
| MacKeown | Very numerous: Ulster generally, Louth etc. Ir. Mac Eoin (Ulster). As Mac Keon. |
| MacOwen | Very rare: Dublin. Ir. Mac Eoghain. See Mac Keon. |
Parishes where McOwen and a second surname are found together
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