- Games & Hobbies, Pikesville
- Garage, Door & Window Products, Pikesville
- Garbage & Rubbish Removal, Pikesville
- Garbage Disposal Equipment Repair & Service, Pikesville
- Garment & Linen Services, Pikesville
- Gas Station, Pikesville - Service & Filling Station
- Gasoline, Pikesville
- Gastroenterologists, Pikesville - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gemologists & Jewelers, Pikesville
- General Business Consulting, Pikesville
- General Business Services, Pikesville
- General Consultants, Pikesville
- General Electric Appliances, Pikesville
- General Freight Trucking, Pikesville - Motor Freight
- General Management Consulting Services, Pikesville - Management Consultants
- General Merchandise Stores, Pikesville
- General Travel Agents & Agencies, Pikesville
- Generators, Compressors, Pumps, Motors & Fans, Pikesville
- Gift Baskets, Pikesville
- Gifts By Type & Occasion, Pikesville
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- Gifts, Cards & Stationery Stores, Pikesville
- Glass & Glass Products, Pikesville
- Glass & Glazing Contractors, Pikesville
- Glass - Auto, Float, Plate, Window & Doors, Pikesville
- Glassware & Chinaware Repair, Pikesville
- Glazing Contractors, Pikesville - Glass - Window Glazing
- Golf Course Architect, Pikesville
- Golf Course Architects, Pikesville
- Golf Course Construction, Pikesville
- Golf Courses, Pikesville
- Gourmet Food Stores, Pikesville
- Gourmet Restaurants, Pikesville
- Government, Pikesville
- Graphic Design Services, Pikesville - Graphic Designer
- Graphic Designer & Artist Services, Pikesville
- Greenhouse Supplies, Kits & Equipment, Pikesville
- Grocery Stores & Supermarkets, Pikesville
- Ground Transportation, Except Passenger, Pikesville
- Group Homes, Pikesville
- Guide & Directory Advertising Services, Pikesville
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