- Games & Hobbies, Simsbury
- Garage Building & Repair, Simsbury - Carports - Garage Builders
- Garage, Door & Window Products, Simsbury
- Garden & Lawn Sprinkler Repair, Installation & Service, Simsbury
- Garment & Linen Services, Simsbury
- Gas Station, Simsbury - Service & Filling Station
- General Business Consulting, Simsbury
- General Business Services, Simsbury
- General Consultants, Simsbury
- General Freight Trucking, Simsbury - Motor Freight
- General Management Consulting Services, Simsbury - Management Consultants
- General Merchandise Stores, Simsbury
- General Travel Agents & Agencies, Simsbury
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- Generators, Compressors, Pumps, Motors & Fans, Simsbury
- Gift Shops, Simsbury - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Simsbury
- Glass & Glass Products, Simsbury
- Glass - Auto, Float, Plate, Window & Doors, Simsbury
- Golf Courses, Simsbury
- Golf Equipment & Supplies Stores, Simsbury - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Simsbury
- Grocery Stores & Supermarkets, Simsbury
- Ground Transportation, Except Passenger, Simsbury
- Gutters & Downspout Cleaning & Repairing, Simsbury
- Gymnastics Schools, Simsbury
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