- Games & Hobbies, Plainville
- Garbage & Rubbish Removal, Plainville
- Garment & Linen Services, Plainville
- Gas Equipment Industrial, Plainville
- Gas Station, Plainville - Service & Filling Station
- Gemologists & Jewelers, Plainville
- General Business Services, Plainville
- General Merchandise Stores, Plainville
- General Travel Agents & Agencies, Plainville
- Gift Shops, Plainville - Gift, Novelty & Souvenir Stores
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- Gifts, Cards & Stationery Stores, Plainville
- Golf Courses, Plainville
- Government, Plainville
- Graphic Design Services, Plainville - Graphic Designer
- Graphic Designer & Artist Services, Plainville
- Greeting Card Stores, Plainville
- Grocery Stores & Supermarkets, Plainville
- Ground Transportation, Except Passenger, Plainville
- Gymnastics Schools, Plainville
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