- Games & Hobbies, Merrimack
- Games Toys & Childrens Vehicles Manufacturers, Merrimack
- Garage Doors & Door Operating Devices, Merrimack
- Garage Doors & Gates, Merrimack - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Merrimack
- Garbage & Rubbish Removal, Merrimack
- Garden & Lawn Sprinkler Repair, Installation & Service, Merrimack
- Garment & Linen Services, Merrimack
- Gas Appliance Repair, Maintenance & Service, Merrimack
- Gas Station, Merrimack - Service & Filling Station
- Gemologists & Jewelers, Merrimack
- General Business Consulting, Merrimack
- General Business Services, Merrimack
- General Consultants, Merrimack
- General Freight Trucking, Merrimack - Motor Freight
- General Hardware Stores, Merrimack
- General Merchandise Stores, Merrimack
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- General Travel Agents & Agencies, Merrimack
- Gift Shops, Merrimack - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Merrimack
- Glass & Glass Products, Merrimack
- Glass - Auto, Float, Plate, Window & Doors, Merrimack
- Golf Equipment & Supplies Stores, Merrimack - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Gourmet Restaurants, Merrimack
- Government, Merrimack
- Granite, Merrimack
- Graphic Design Services, Merrimack - Graphic Designer
- Graphic Designer & Artist Services, Merrimack
- Greeting Card Stores, Merrimack
- Grocery Stores & Supermarkets, Merrimack
- Ground Transportation, Except Passenger, Merrimack
- Guide & Directory Advertising Services, Merrimack
- Gun & Hunting & Fishing Clubs, Merrimack
- Gutters & Downspout Cleaning & Repairing, Merrimack
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