- Games & Hobbies, Guilford
- Garage Building & Repair, Guilford - Carports - Garage Builders
- Garage, Door & Window Products, Guilford
- Garbage & Rubbish Removal, Guilford
- Garden & Lawn Sprinkler Repair, Installation & Service, Guilford
- Garment & Linen Services, Guilford
- Gas Station, Guilford - Service & Filling Station
- Gastroenterologists, Guilford - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Guilford
- General Business Consulting, Guilford
- General Business Services, Guilford
- General Consultants, Guilford
- General Management Consulting Services, Guilford - Management Consultants
- General Merchandise Stores, Guilford
- General Surgeons, Guilford - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Guilford
- Generators, Compressors, Pumps, Motors & Fans, Guilford
- Geophysical Research, Guilford
- Gift Baskets, Guilford
- Gift Wrapping Service, Guilford
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- Gifts By Type & Occasion, Guilford
- Gifts, Cards & Stationery Stores, Guilford
- Glass & Glass Products, Guilford
- Glass & Glazing Contractors, Guilford
- Glass - Auto, Float, Plate, Window & Doors, Guilford
- Glass Plate Windows, Guilford
- Glazing Contractors, Guilford - Glass - Window Glazing
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Guilford
- Golf Courses, Guilford
- Gourmet Restaurants, Guilford
- Government, Guilford
- Granite, Guilford
- Graphic Design Services, Guilford - Graphic Designer
- Graphic Designer & Artist Services, Guilford
- Grease Traps, Guilford
- Greenhouse Supplies, Kits & Equipment, Guilford
- Greeting Card Stores, Guilford
- Grocery Stores & Supermarkets, Guilford
- Ground Transportation, Except Passenger, Guilford
- Gymnastics Schools, Guilford
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