- Games & Hobbies, Frederick
- Garage Building & Repair, Frederick - Carports - Garage Builders
- Garage Doors & Door Operating Devices, Frederick
- Garage Doors & Gates, Frederick - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Frederick
- Garbage & Rubbish Removal, Frederick
- Garbage Disposal Equipment Repair & Service, Frederick
- Garment & Linen Services, Frederick
- Gas & Air Compressors, Frederick
- Gas Companies, Frederick
- Gas Engine, Frederick
- Gas Equipment Industrial, Frederick
- Gas Station, Frederick - Service & Filling Station
- Gasoline, Frederick
- Gastroenterologists, Frederick - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Frederick
- General Business Consulting, Frederick
- General Business Services, Frederick
- General Consultants, Frederick
- General Freight Trucking, Frederick - Motor Freight
- General Hardware Stores, Frederick
- General Management Consulting Services, Frederick - Management Consultants
- General Merchandise Stores, Frederick
- General Surgeons, Frederick - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Frederick
- Generator Sales & Rental, Frederick - Contractors Supplies & Equipment
- Generators, Compressors, Pumps, Motors & Fans, Frederick
- Geophysical Research, Frederick
- Geotechnical Engineer, Frederick
- Geotechnical Soils Engineer, Frederick
- Geothermal Heating & Cooling Contractors, Frederick - Geothermal HVAC - Installation
- Geriatricians, Frederick - Geriatric Specialists, Doctors, Physicians & Surgeons
- Gift Baskets, Frederick
- Gift Shops, Frederick - Gift, Novelty & Souvenir Stores
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- Gifts By Type & Occasion, Frederick
- Gifts, Cards & Stationery Stores, Frederick
- Glass & Glass Products, Frederick
- Glass & Glazing Contractors, Frederick
- Glass - Auto, Float, Plate, Window & Doors, Frederick
- Glass - Beveled, Carved, Etched & Ornamental, Frederick
- Glass Stained & Leaded, Frederick
- Glass Tinting & Coating, Frederick - Home - Car Window Tinting
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Frederick
- Golf Courses, Frederick
- Golf Driving Ranges, Frederick
- Golf Equipment & Supplies Stores, Frederick - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Frederick
- Gourmet Food Stores, Frederick
- Gourmet Restaurants, Frederick
- Government, Frederick
- Government Information & Offices Miscellaneous, Frederick
- Grain Elevators, Frederick
- Granite, Frederick
- Granite Counter Tops, Frederick
- Graphic Design Services, Frederick - Graphic Designer
- Graphic Designer & Artist Services, Frederick
- Greek Churches, Frederick
- Greek Restaurants, Frederick
- Greeting Card Stores, Frederick
- Grills & Grilling Equipment & Supplies, Frederick
- Grocery Stores & Supermarkets, Frederick
- Ground Transportation, Except Passenger, Frederick
- Group Homes, Frederick
- Gun Repair & Services, Frederick
- Guns & Gunsmith Services, Frederick
- Gutters & Downspout Cleaning & Repairing, Frederick
- Gymnastics Schools, Frederick
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