- Games & Hobbies, Old Saybrook
- Garage Building & Repair, Old Saybrook - Carports - Garage Builders
- Garage Doors & Door Operating Devices, Old Saybrook
- Garage Doors & Gates, Old Saybrook - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Old Saybrook
- Garbage & Rubbish Removal, Old Saybrook
- Garment & Linen Services, Old Saybrook
- Gas Equipment & Supplies, Old Saybrook
- Gas Line Installation Contractors, Old Saybrook - Gas Pipe Installation - Repair Service
- Gas Station, Old Saybrook - Service & Filling Station
- Gasket, Old Saybrook - Supply & Wholesale - Gaskets, Packing & Sealing Device
- Gears, Old Saybrook
- Gears & Gear Cutting, Old Saybrook
- General Business Consulting, Old Saybrook
- General Business Services, Old Saybrook
- General Consultants, Old Saybrook
- General Hardware Stores, Old Saybrook
- General Management Consulting Services, Old Saybrook - Management Consultants
- General Merchandise Stores, Old Saybrook
- General Travel Agents & Agencies, Old Saybrook
- Generators, Compressors, Pumps, Motors & Fans, Old Saybrook
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- Gift Baskets, Old Saybrook
- Gifts By Type & Occasion, Old Saybrook
- Gifts, Cards & Stationery Stores, Old Saybrook
- Glass & Glass Products, Old Saybrook
- Glass - Auto, Float, Plate, Window & Doors, Old Saybrook
- Glass Plate Windows, Old Saybrook
- Glass Stained & Leaded, Old Saybrook
- Golf Courses, Old Saybrook
- Golf Equipment & Supplies Stores, Old Saybrook - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gospel Church, Old Saybrook
- Gourmet Food Stores, Old Saybrook
- Government, Old Saybrook
- Graphic Design Services, Old Saybrook - Graphic Designer
- Graphic Designer & Artist Services, Old Saybrook
- Greeting Card Stores, Old Saybrook
- Grocery Stores & Supermarkets, Old Saybrook
- Ground Transportation, Except Passenger, Old Saybrook
- Group Homes, Old Saybrook
- Gun Repair & Services, Old Saybrook
- Guns & Gunsmith Services, Old Saybrook
- Gymnastics Schools, Old Saybrook
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