- Games & Hobbies, Waltham
- Garage Door Repair, Waltham
- Garage, Door & Window Products, Waltham
- Garbage & Rubbish Removal, Waltham
- Garden & Lawn Sprinkler Repair, Installation & Service, Waltham
- Garment & Linen Services, Waltham
- Gas Companies, Waltham
- Gas Detection, Asbestos & Lead Contractors, Waltham
- Gas Engine, Waltham
- Gas Line Installation Contractors, Waltham - Gas Pipe Installation - Repair Service
- Gas Station, Waltham - Service & Filling Station
- General Business Consulting, Waltham
- General Business Services, Waltham
- General Consultants, Waltham
- General Freight Trucking, Waltham - Motor Freight
- General Hardware Stores, Waltham
- General Management Consulting Services, Waltham - Management Consultants
- General Merchandise Stores, Waltham
- General Surgeons, Waltham - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Waltham
- Generators, Compressors, Pumps, Motors & Fans, Waltham
- Geotechnical Engineer, Waltham
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- Gift Baskets, Waltham
- Gift Shops, Waltham - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Waltham
- Gifts, Cards & Stationery Stores, Waltham
- Glass & Glass Products, Waltham
- Glass - Auto, Float, Plate, Window & Doors, Waltham
- Glass Products Manufacturers, Waltham
- Glass Stained & Leaded, Waltham
- Golf Tours, Waltham
- Gourmet Restaurants, Waltham
- Government, Waltham
- Granite, Waltham
- Graphic Design Services, Waltham - Graphic Designer
- Graphic Designer & Artist Services, Waltham
- Grinding Services, Waltham
- Grocery Stores & Supermarkets, Waltham
- Ground Transportation, Except Passenger, Waltham
- Guide & Directory Advertising Services, Waltham
- Gun Repair & Services, Waltham
- Guns & Gunsmith Services, Waltham
- Gymnastics Schools, Waltham
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