- Games & Hobbies, Wallingford
- Garage Building & Repair, Wallingford - Carports - Garage Builders
- Garage Doors & Door Operating Devices, Wallingford
- Garage Doors & Gates, Wallingford - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Wallingford
- Garbage & Rubbish Removal, Wallingford
- Garden & Lawn Sprinkler Repair, Installation & Service, Wallingford
- Garment & Linen Services, Wallingford
- Gas & Air Compressors, Wallingford
- Gas Companies, Wallingford
- Gas Equipment Industrial, Wallingford
- Gas Station, Wallingford - Service & Filling Station
- Gaskets Packing & Sealing Devices Manufacturers, Wallingford
- Gate & Fence Repair, Wallingford
- Gears, Wallingford
- Gears & Gear Cutting, Wallingford
- General Business Consulting, Wallingford
- General Business Services, Wallingford
- General Consultants, Wallingford
- General Freight Trucking, Wallingford - Motor Freight
- General Hardware Stores, Wallingford
- General Management Consulting Services, Wallingford - Management Consultants
- General Merchandise Stores, Wallingford
- General Travel Agents & Agencies, Wallingford
- Generators, Compressors, Pumps, Motors & Fans, Wallingford
- Geriatric Care Management, Wallingford
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- Gift Baskets, Wallingford
- Gift Shops, Wallingford - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Wallingford
- Gifts, Cards & Stationery Stores, Wallingford
- Glass & Glass Products, Wallingford
- Glass - Auto, Float, Plate, Window & Doors, Wallingford
- Glass Plate Windows, Wallingford
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Wallingford
- Golf Clubs Private, Wallingford
- Golf Courses, Wallingford
- Golf Equipment & Supplies Stores, Wallingford - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Wallingford
- Granite, Wallingford
- Graphic Design Services, Wallingford - Graphic Designer
- Graphic Designer & Artist Services, Wallingford
- Greeting Card Stores, Wallingford
- Grills & Grilling Equipment & Supplies, Wallingford
- Grinding Services, Wallingford
- Grocery Stores & Supermarkets, Wallingford
- Ground Transportation, Except Passenger, Wallingford
- Group Homes, Wallingford
- Gun & Hunting & Fishing Clubs, Wallingford
- Gun Repair & Services, Wallingford
- Guns & Gunsmith Services, Wallingford
- Gutter Covers, Wallingford
- Gymnastics Schools, Wallingford
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