All Industry companies in Castlewellan
- Alternative Heat Ltd - Castlewellan
- Autopass - Castlewellan
- Barry Fletcher Architects - Castlewellan
- Brandon Hire (Castlewellan) - Castlewellan
- Brian McAlerney - Castlewellan
- C S S C Covert Security Solutions - Castlewellan
- Castle Glen Ltd - Castlewellan
- Cunningham Contracts - Castlewellan
- Digital Components Ltd - Castlewellan
- Feedwell Animal Foods Ltd. - Castlewellan
- Fintan McMullan Ltd - Castlewellan
- Green Energy 4u Ltd - Castlewellan
- Henry John McVeigh - Castlewellan
- Herron Engineering Ltd. - Castlewellan
- John Shilliday Ltd - Castlewellan
- Kilmegan Embroideries - Castlewellan
- Legmore Concrete Ltd. - Castlewellan
- M J Donnelly - Castlewellan
- M S Contracts (N I) Ltd - Castlewellan
- McComb 4x4 - Castlewellan
- Mourne Fules - Castlewellan
- Mourneview Dairy - Castlewellan
- Mr Brannigan - Castlewellan
- O Hare S Millers - Castlewellan
- P J T Sales - Castlewellan
- Red-Jet - Castlewellan
- T S Foods Ltd. - Castlewellan
- Tiles of Mourne - Castlewellan
- Tj's Gems - Castlewellan
- Walter Watson Ltd. - Castlewellan
- Winston Smith - Castlewellan