- Games & Hobbies, New Britain
- Garage Building & Repair, New Britain - Carports - Garage Builders
- Garment & Linen Services, New Britain
- Gas Station, New Britain - Service & Filling Station
- Gaskets Packing & Sealing Devices Manufacturers, New Britain
- Gate & Fence Repair, New Britain
- Gemologists & Jewelers, New Britain
- General Business Consulting, New Britain
- General Business Services, New Britain
- General Consultants, New Britain
- General Freight Trucking, New Britain - Motor Freight
- General Hardware Stores, New Britain
- General Management Consulting Services, New Britain - Management Consultants
- General Merchandise Stores, New Britain
- General Surgeons, New Britain - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, New Britain
- Generators, Compressors, Pumps, Motors & Fans, New Britain
- Gift Baskets, New Britain
- Gift Shops, New Britain - Gift, Novelty & Souvenir Stores
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- Gifts By Type & Occasion, New Britain
- Gifts Wholesale & Retail, New Britain
- Gifts, Cards & Stationery Stores, New Britain
- Glass & Glass Products, New Britain
- Glass - Auto, Float, Plate, Window & Doors, New Britain
- Glass Plate Windows, New Britain
- Gold, Silver & Platinum Buyers, Sellers & Dealers, New Britain
- Government, New Britain
- Granite, New Britain
- Graphic Design Services, New Britain - Graphic Designer
- Graphic Designer & Artist Services, New Britain
- Greek Churches, New Britain
- Grinding Services, New Britain
- Grocery Store Delivery Service, New Britain
- Grocery Stores & Supermarkets, New Britain
- Ground Transportation, Except Passenger, New Britain
- Group Homes, New Britain
- Gun Repair & Services, New Britain
- Guns & Gunsmith Services, New Britain
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