- Games & Hobbies, Cos Cob
- Garbage & Rubbish Removal, Cos Cob
- Garbage Disposal Equipment Commercial, Cos Cob
- Garden & Lawn Sprinkler Repair, Installation & Service, Cos Cob
- Gas Station, Cos Cob - Service & Filling Station
- General Business Consulting, Cos Cob
- General Business Services, Cos Cob
- General Consultants, Cos Cob
- General Management Consulting Services, Cos Cob - Management Consultants
- General Travel Agents & Agencies, Cos Cob
- Generator Sales & Rental, Cos Cob - Contractors Supplies & Equipment
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- Gift Shops, Cos Cob - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Cos Cob
- Glass & Glass Products, Cos Cob
- Glass - Auto, Float, Plate, Window & Doors, Cos Cob
- Glass - Beveled, Carved, Etched & Ornamental, Cos Cob
- Glass Plate Windows, Cos Cob
- Golf Lessons & Instruction, Cos Cob
- Government, Cos Cob
- Grocery Stores & Supermarkets, Cos Cob
- Ground Transportation, Except Passenger, Cos Cob
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