- Games & Hobbies, Marlboro
- Garage Doors & Gates, Marlboro - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Marlboro
- Garden & Lawn Sprinkler Repair, Installation & Service, Marlboro
- Garment & Linen Services, Marlboro
- Gas Station, Marlboro - Service & Filling Station
- Gastroenterologists, Marlboro - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Marlboro
- General Business Services, Marlboro
- General Consultants, Marlboro
- General Management Consulting Services, Marlboro - Management Consultants
- General Merchandise Stores, Marlboro
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- General Travel Agents & Agencies, Marlboro
- Gift Shops, Marlboro - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Marlboro
- Gifts, Cards & Stationery Stores, Marlboro
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Marlboro
- Golf Clubs Private, Marlboro
- Golf Courses, Marlboro
- Government, Marlboro
- Graphic Design Services, Marlboro - Graphic Designer
- Graphic Designer & Artist Services, Marlboro
- Grocery Stores & Supermarkets, Marlboro
- Ground Transportation, Except Passenger, Marlboro
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