Most U3As have websites. For details of your nearest U3A, click on the names below. For those which do not have a website, email contacts are:
Ards Peninsula — membersardspenu3a@gmail.com ; Others — nithirdage@gmail.com
| County | U3A | Towns & Area |
| Antrim | Ballymena | Ballymena |
| Ballymoney | Ballymoney | |
| Belfast | Belfast | |
| East Antrim | Carrickfergus, Larne, Newtownabbey | |
| Glens & Dalriada | Ballycastle, Cushendall, Cushendun | |
| Lisburn | Lisburn | |
| Massereene | Antrim | |
| Armagh | Armagh & District | Armagh |
| Crossmaglen | Crossmaglen | |
| Upper Bann | Lurgan, Portadown | |
| Derry/ Londonderry | Causeway | Coleraine, Portstewart, Portrush |
| Foyle | Londonderry | |
| Sperrin | Magherafelt, Maghera, Draperstown, Cookstown, Toome & around | |
| Down | Ards Penninsula | Donaghadee & Ards Peninsula |
| Banbridge & District | Banbridge | |
| Comber & District | Comber | |
| Downe | Downpatrick, Ardglass, Killyleagh, Strangford | |
| Holywood District | Holywood & around | |
| Mourne | Kilkeel | |
| Newry | Newry, Rostrevor, Warrenpoint | |
| North Down & Ards | Bangor, Newtownards, Donaghadee | |
| Shimna | Newcastle, Dundrum | |
| Fermanagh | Erne | Enniskillen |
| Tyrone | Omagh District | Omagh |
