- Games & Hobbies, Somerville
- Garage Doors & Door Operating Devices, Somerville
- Garage Doors & Gates, Somerville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Somerville
- Garbage & Rubbish Removal, Somerville
- Garden & Lawn Sprinkler Repair, Installation & Service, Somerville
- Garment & Linen Services, Somerville
- Gas Equipment Industrial, Somerville
- Gas Station, Somerville - Service & Filling Station
- Gasoline, Somerville
- Gastroenterologists, Somerville - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Services, Somerville
- General Freight Trucking, Somerville - Motor Freight
- General Hardware Stores, Somerville
- General Management Consulting Services, Somerville - Management Consultants
- General Merchandise Stores, Somerville
- General Travel Agents & Agencies, Somerville
- Generator Sales & Rental, Somerville - Contractors Supplies & Equipment
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- Generators, Compressors, Pumps, Motors & Fans, Somerville
- Gift Baskets, 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, Plastic & Rubber Working Machinery, Somerville
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Somerville
- Gourmet Restaurants, Somerville
- Government, Somerville
- Graphic Design Services, Somerville - Graphic Designer
- Graphic Designer & Artist Services, Somerville
- Greeting Card Stores, Somerville
- Grocery Stores & Supermarkets, Somerville
- Ground Transportation, Except Passenger, Somerville
- Gutters & Downspout Cleaning & Repairing, Somerville
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