- Games & Hobbies, Plainville
- Garage Building & Repair, Plainville - Carports - Garage Builders
- Garage Doors & Gates, Plainville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Plainville
- Garbage & Rubbish Removal, Plainville
- Garden & Lawn Equipment & Supplies Rental & Leasing, Plainville
- Garment & Linen Services, Plainville
- Gas Station, Plainville - Service & Filling Station
- Gears, Plainville
- Gears & Gear Cutting, Plainville
- General Business Consulting, Plainville
- General Business Services, Plainville
- General Consultants, Plainville
- General Freight Trucking, Plainville - Motor Freight
- General Hardware Stores, Plainville
- General Merchandise Stores, Plainville
- General Travel Agents & Agencies, Plainville
- Generators, Compressors, Pumps, Motors & Fans, Plainville
- Gift Baskets, Plainville
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- Gift Shops, Plainville - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Plainville
- Gifts, Cards & Stationery Stores, Plainville
- Glass & Glass Products, Plainville
- Glass & Glazing Contractors, Plainville
- Glass - Auto, Float, Plate, Window & Doors, Plainville
- Glass Repair, Plainville - Car, Window, Auto Glass Repair
- Government, Plainville
- Granite, Plainville
- Graphic Design Services, Plainville - Graphic Designer
- Graphic Designer & Artist Services, Plainville
- Grinding Services, Plainville
- Grocery Stores & Supermarkets, Plainville
- Ground Transportation, Except Passenger, Plainville
- Group Homes, Plainville
- Guard Rails, Plainville
- Gun Repair & Services, Plainville
- Guns & Gunsmith Services, Plainville
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