| J & G Hamilton - Aluminium production |
| J & T Enterprises Ltd - Manufacture of basic pharmaceutical products |
| J C P Joinery & Glazing - Painting and glazing |
| J D Young - Farming of cattle, dairy farming |
| J E J Hulatt - Dental practice activities |
| J Evans - Maintenance and repair of motor vehicles |
| J G L & M I McDonough - Dental practice activities |
| J H Hannon - Painting and glazing |
| J Irwin - Medical practice activities |
| J J B Sports PLC - Other retail sale in specialised stores |
| J J B Sports PLC - Other retail sale in specialised stores |
| J J Mccullough - Farming of cattle, dairy farming |
| J K H Shop & Office Fitting - Other building installation |
| J L Systems - Wholesale of other household goods |
| J M C Restaurants Ltd - Restaurant |
| J M Photos - Operation of arts facilities |
| J McMinn - Sale of motor vehicle parts and accessories |
| J W H Lee - Manufacture of other furniture |
| J Willis - Installation of electrical wiring and fittings |
| Jackpot - Retail sale of clothing |
| Jackson's - Manufacture of other furniture |
| Jacob Marley's Tea Rooms - Restaurant |
| James Baird - Farming of cattle, dairy farming |
| James Mckeown & Co Ltd - Retail sale of books, newspapers and stationary |
| Jamisons Gas Centre - Manufacture of non-electric domestic appliances |
| Janard - Hairdressing and other beauty treatment |
| Janet Moffett - Adult and other education not elsewhere classified |
| Jas McAreavy - Farming of cattle, dairy farming |
| Javaman - Restaurant |
| JCL Plumbing & Heating - Plumber |
| Jean Scene - Retail sale of clothing |
| Jeanette Kidd - Hairdressing and other beauty treatment |
| Jesse Blinds & Shutters Ltd - Joinery installation |
| Jessops - Other retail sale in specialised stores |
| Jo Jingles - Adult and other education not elsewhere classified |
| John Ferguson - Other service activities not elsewhere classified |
| John K Cathcart Ltd - Manufacture of machine tools |
| John M Hanna - Other retail sale in specialised stores |
| John P Slavin - Legal activities |
| John Preston & Co (Belfast) Ltd - Activities of other transport agencies |
| John Seawright - Sale of motor vehicles |
| Johnston Gilpin & Co Ltd - Manufacture of other forestry machinery |
| Jolly Rodgers Day Nursery - Primary education |
| Jollye's - Manufacture of prepared pet foods |
| Jonathan Leitch - Dental practice activities |
| Jordan Concrete Ltd - Manufacture of ready-mixed concrete |
| Joseph Lockhart & Son - Legal activities |
| Jumper Ltd - Retail sale of clothing |
| Jim Heanen - Accountant |
| Joseph H Lockhart - Accounting Auditing And Bookkeeping |
| J R Mckee & Co - Chartered Accountants |
| J & G Hamilton - Aluminium Fabricators |
| Janard - Unisex Hair Salons |
| Jiri Books - Retailers Of Books |
| John Seawright - Commercial Vehicle Dealers |
| Jo Jingles - Technical Colleges |
| Jordon Concrete Ltd - Manufanturers Of Precast Concretes |
| J & T Enterprises Ltd. - Wholesalers Of Confectionery |
| J. & T. Enterprises Ltd - Wholesalers Of Confectionery |
| John Frackelton & Son Ltd. - Retailers Of Ceramic Tiles |
| J & J Wright - Dairy Farm |
| James Baird - Dairy Farmers |
| John David Young - Dairy Farmers |
| J M Photos - Dance Halls Studios And Schools |
| J G L & M I Mcdonough - Dental Clinics And Office |
| John O'doherty Dental Care - Dentist |
| J Patterson & Son - Chemists - Dispensing |
| John Preston & Co (belfast) Ltd - Wholesalers Of Pharmaceuticals |
| J Clenaghan - Electrical Work Contractors |
| Johnston Gilpin & Co Ltd - Agricultural And Groundcare Machinery Dealers |
| James Mcdowell - Agricultural Contractors |
| Just Blinds - Miscellaneous Textile Finishers |
| Joy's Flowers - Florist |
| J B Ironing Services - Garment Pressing Service |
| James Swan - General Livestock |
| John Riddel & Son Ltd - Wholesalers Of Hardware |
| John Patrick Slavink - Legal Services |
| Jesse Blinds & Shutters Ltd - Blind & Shutter Manufacturer |
| J H Irwin & Son (fuels) Ltd - Fuel Oil Distributors |
| Jordan Plumbing & Dust Suppression Servi - Plumbing Contractors |
| Jebb - Plumbing Heating Air-Conditioning |
| J C L Plumbing And Heating - Plumbing Heating And Air-Conditioning Contractors |
| John Thompson & Sons Ltd. - Manufacturers Of Animal Food |
| J.m.c. Restaurants Ltd - Fast Food Restaurant Proprietors |
| Jeffers Home Bakery - Bakers' Shops |
| Jeffers Home Bakery - Bakers' Shops |
| Jeffers Home Bakery - Retail Bakers' Shops |
| John K Cathcart Ltd. - Miscellaneous Retailers |
| Jollye's - Pet Foods And Animal Feeds |
| James Gilmore & Son - Asphalt And Coated Macadam Laying Contractors |
| John Campbell &sons - Civil Engineer |
| John Mcquillan (contracts) Ltd - Road Surfacing And Paving Contractors |
| J P Creaney - Shoe Shops |
| John M Hanna Cycles & Car Accesories - Cycle Shop |
| Jonathan Duffy Cars - Used Car Dealer |
| Joseph K Brankin - Market Garden |
| James W H Lee - Manufacturers Of Wood Household Furniture |
| JRC House Clearance & Waste Disposal - Waste Management Service |