- Games & Hobbies, Herndon
- Garage Door Repair, Herndon
- Garage Doors & Door Operating Devices, Herndon
- Garage Doors & Gates, Herndon - Stores & Companies - Install & Repair Services
- Garage Organizers, Herndon - Garage Storage Companies
- Garage, Door & Window Products, Herndon
- Garbage & Rubbish Removal, Herndon
- Garden & Lawn Sprinkler Repair, Installation & Service, Herndon
- Garment & Linen Services, Herndon
- Gas Companies, Herndon
- Gas Detection, Asbestos & Lead Contractors, Herndon
- Gas Station, Herndon - Service & Filling Station
- Gastroenterologists, Herndon - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Consulting, Herndon
- General Business Services, Herndon
- General Consultants, Herndon
- General Freight Trucking, Herndon - Motor Freight
- General Hardware Stores, Herndon
- General Management Consulting Services, Herndon - Management Consultants
- General Merchandise Stores, Herndon
- General Travel Agents & Agencies, Herndon
- Gift Shops, Herndon - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Herndon
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- Gifts, Cards & Stationery Stores, Herndon
- Glass & Glass Products, Herndon
- Glass & Glazing Contractors, Herndon
- Glass - Auto, Float, Plate, Window & Doors, Herndon
- Glass Repair, Herndon - Car, Window, Auto Glass Repair
- Glassware & Chinaware Repair, Herndon
- Golf Courses, Herndon
- Gourmet Food Stores, Herndon
- Gourmet Restaurants, Herndon
- Government, Herndon
- Government Information & Offices Miscellaneous, Herndon
- Granite, Herndon
- Graphic Design Services, Herndon - Graphic Designer
- Graphic Designer & Artist Services, Herndon
- Gratings Metal, Herndon
- Greeting Card Stores, Herndon
- Grills & Grilling Equipment & Supplies, Herndon
- Grocery Stores & Supermarkets, Herndon
- Ground Transportation, Except Passenger, Herndon
- Gun Repair & Services, Herndon
- Guns & Gunsmith Services, Herndon
- Gym Equipment & Supplies, Herndon
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