- Games & Hobbies, Fitchburg
- Garage Doors & Door Operating Devices, Fitchburg
- Garage Doors & Gates, Fitchburg - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Fitchburg
- Garment & Linen Services, Fitchburg
- Gas Appliance Repair, Maintenance & Service, Fitchburg
- Gas Station, Fitchburg - Service & Filling Station
- Gasoline, Fitchburg
- Gemologists & Jewelers, Fitchburg
- Genealogy, Fitchburg
- General Business Consulting, Fitchburg
- General Business Services, Fitchburg
- General Consultants, Fitchburg
- General Freight Trucking, Fitchburg - Motor Freight
- General Management Consultants & Services, Fitchburg
- General Management Consulting Services, Fitchburg - Management Consultants
- General Merchandise Stores, Fitchburg
- General Travel Agents & Agencies, Fitchburg
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- Generators, Compressors, Pumps, Motors & Fans, Fitchburg
- Gift Shops, Fitchburg - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Fitchburg
- Golf Courses, Fitchburg
- Gourmet Restaurants, Fitchburg
- Government, Fitchburg
- Government And Administration Attorneys & Lawyers, Fitchburg
- Government And Administration Lawyers & Attorneys, Fitchburg
- Government Contract & Relations Consultants, Fitchburg
- Government Information & Offices Miscellaneous, Fitchburg
- Grading Contractors, Fitchburg - Excavating - Excavation Companies
- Graphic Design Services, Fitchburg - Graphic Designer
- Graphic Designer & Artist Services, Fitchburg
- Greeting Card Stores, Fitchburg
- Grocery Stores & Supermarkets, Fitchburg
- Ground Transportation, Except Passenger, Fitchburg
- Gymnastics Schools, Fitchburg
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