- Games & Hobbies, Somerville
- Garage Door Repair, Somerville
- Garage Doors & Gates, Somerville - Stores & Companies - Install & Repair Services
- Garage Doors & Openers Contractors, Somerville
- Garage, Door & Window Products, Somerville
- Garbage & Rubbish Removal, Somerville
- Garden & Lawn Sprinklers Systems – Equipment, Parts & Supplies, Somerville
- Garment & Linen Services, Somerville
- Gas Appliance Repair, Maintenance & Service, Somerville
- Gas Companies, Somerville
- Gas Engine, Somerville
- Gas Station, Somerville - Service & Filling Station
- Gauges, Somerville
- Gauges & Gages, Somerville
- Gemologists & Jewelers, Somerville
- General Business Consulting, Somerville
- General Business Services, Somerville
- General Consultants, Somerville
- General Freight Trucking, Somerville - Motor Freight
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- General Hardware Stores, Somerville
- General Management Consulting Services, Somerville - Management Consultants
- General Merchandise Stores, Somerville
- General Surgeons, Somerville - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Somerville
- Gift Shops, Somerville - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Somerville
- Gifts, Cards & Stationery Stores, Somerville
- Glass & Glass Products, Somerville
- Glass - Auto, Float, Plate, Window & Doors, Somerville
- Glass - Beveled, Carved, Etched & Ornamental, Somerville
- Gourmet Restaurants, Somerville
- Government, Somerville
- Graphic Design Services, Somerville - Graphic Designer
- Graphic Designer & Artist Services, Somerville
- Grease Traps, Somerville
- Grocery Stores & Supermarkets, Somerville
- Ground Transportation, Except Passenger, Somerville
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