- Games & Hobbies, Newmarket
- Garage Door Repair, Newmarket
- Garage Doors & Door Operating Devices, Newmarket
- Garage Doors & Gates, Newmarket - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Newmarket
- Garbage & Rubbish Removal, Newmarket
- Garment & Linen Services, Newmarket
- Gas Companies, Newmarket
- Gas Station, Newmarket - Service & Filling Station
- Gauges, Newmarket
- Gauges & Gages, Newmarket
- Gay & Lesbian Service Organizations, Newmarket
- Gears, Newmarket
- General Business Consulting, Newmarket
- General Business Services, Newmarket
- General Consultants, Newmarket
- General Freight Trucking, Newmarket - Motor Freight
- General Hardware Stores, Newmarket
- General Management Consulting Services, Newmarket - Management Consultants
- General Merchandise Stores, Newmarket
- General Travel Agents & Agencies, Newmarket
- Generators, Compressors, Pumps, Motors & Fans, Newmarket
- Gift Baskets, Newmarket
- Gift Shops, Newmarket - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Newmarket
- Gifts, Cards & Stationery Stores, Newmarket
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- Glass & Glass Products, Newmarket
- Glass & Glazing Contractors, Newmarket
- Glass - Auto, Float, Plate, Window & Doors, Newmarket
- Glass - Beveled, Carved, Etched & Ornamental, Newmarket
- Glass Tinting & Coating, Newmarket - Home - Car Window Tinting
- Glass, Plastic & Rubber Working Machinery, Newmarket
- Golf Courses, Newmarket
- Golf Driving Ranges, Newmarket
- Golf Equipment & Supplies Stores, Newmarket - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Newmarket
- Goodyear Tires, Newmarket - Dealers
- Gospel Church, Newmarket
- Government, Newmarket
- Granite, Newmarket
- Graphic Design Services, Newmarket - Graphic Designer
- Graphic Designer & Artist Services, Newmarket
- Greek Restaurants, Newmarket
- Greeting Card Stores, Newmarket
- Grills & Grilling Equipment & Supplies, Newmarket
- Grinding Services, Newmarket
- Grocery Stores & Supermarkets, Newmarket
- Ground Transportation, Except Passenger, Newmarket
- Gutter & Flashing Contractors, Newmarket - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gym Equipment & Supplies, Newmarket
- Gymnastic Clubs, Newmarket
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