- Games & Hobbies, Sykesville
- Garage Door Repair, Sykesville
- Garage Doors & Door Operating Devices, Sykesville
- Garage Doors & Gates, Sykesville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Sykesville
- Garbage & Rubbish Removal, Sykesville
- Garment & Linen Services, Sykesville
- Gas Companies, Sykesville
- Gas Station, Sykesville - Service & Filling Station
- Gasoline, Sykesville
- General Business Consulting, Sykesville
- General Business Services, Sykesville
- General Consultants, Sykesville
- General Freight Trucking, Sykesville - Motor Freight
- General Hardware Stores, Sykesville
- General Management Consulting Services, Sykesville - Management Consultants
- General Merchandise Stores, Sykesville
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- General Travel Agents & Agencies, Sykesville
- Generators, Compressors, Pumps, Motors & Fans, Sykesville
- Gifts, Cards & Stationery Stores, Sykesville
- Glass & Glass Products, Sykesville
- Glass & Glazing Contractors, Sykesville
- Glass - Auto, Float, Plate, Window & Doors, Sykesville
- Glass Tinting & Coating, Sykesville - Home - Car Window Tinting
- Golf Courses, Sykesville
- Golf Driving Ranges, Sykesville
- Government, Sykesville
- Graphic Design Services, Sykesville - Graphic Designer
- Graphic Designer & Artist Services, Sykesville
- Grocery Stores & Supermarkets, Sykesville
- Ground Transportation, Except Passenger, Sykesville
- Guards Door & Window, Sykesville
- Gun & Hunting & Fishing Clubs, Sykesville
- Gymnastics Schools, Sykesville
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