- Games & Hobbies, Rockville
- Garage Building & Repair, Rockville - Carports - Garage Builders
- Garage Door Repair, Rockville
- Garage Doors & Door Operating Devices, Rockville
- Garage Doors & Gates, Rockville - Stores & Companies - Install & Repair Services
- Garage Organizers, Rockville - Garage Storage Companies
- Garage, Door & Window Products, Rockville
- Garbage & Rubbish Removal, Rockville
- Garden & Lawn Sprinkler Repair, Installation & Service, Rockville
- Garment & Linen Services, Rockville
- Gas Companies, Rockville
- Gas Detection, Asbestos & Lead Contractors, Rockville
- Gas Engine, Rockville
- Gas Station, Rockville - Service & Filling Station
- Gasoline, Rockville
- Gastroenterologists, Rockville - GI Doctors, Physicians & Surgeons (Gastroenterology)
- Gate & Fence Repair, Rockville
- Gemologists & Jewelers, Rockville
- General Business Consulting, Rockville
- General Business Services, Rockville
- General Consultants, Rockville
- General Freight Trucking, Rockville - Motor Freight
- General Hardware Stores, Rockville
- General Management Consulting Services, Rockville - Management Consultants
- General Merchandise Stores, Rockville
- General Surgeons, Rockville - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Rockville
- Generator Sales & Rental, Rockville - Contractors Supplies & Equipment
- Generators, Compressors, Pumps, Motors & Fans, Rockville
- Genetics Specialists, Rockville - Doctors, Physicians & Surgeons
- Gift Baskets, Rockville
- Gift Shops, Rockville - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Rockville
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- Gifts, Cards & Stationery Stores, Rockville
- Glass & Glass Products, Rockville
- Glass & Glazing Contractors, Rockville
- Glass - Auto, Float, Plate, Window & Doors, Rockville
- Glass Block & Architectural, Rockville
- Glass Products Manufacturers, Rockville
- Glass Repair, Rockville - Car, Window, Auto Glass Repair
- Glass Tinting & Coating, Rockville - Home - Car Window Tinting
- Glassware Retail, Rockville
- Golf Clubs Private, Rockville
- Golf Course Architect, Rockville
- Golf Course Architects, Rockville
- Golf Course Consultants, Rockville
- Golf Courses, Rockville
- Golf Equipment & Supplies Stores, Rockville - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Golf Lessons & Instruction, Rockville
- Gourmet Food Stores, Rockville
- Gourmet Restaurants, Rockville
- Government, Rockville
- Government Information & Offices Miscellaneous, Rockville
- Granite, Rockville
- Graphic Design Services, Rockville - Graphic Designer
- Graphic Designer & Artist Services, Rockville
- Greek Restaurants, Rockville
- Grills & Grilling Equipment & Supplies, Rockville
- Grocery Stores & Supermarkets, Rockville
- Ground Transportation, Except Passenger, Rockville
- Group Homes, Rockville
- Guide & Directory Advertising Services, Rockville
- Gun Repair & Services, Rockville
- Guns & Gunsmith Services, Rockville
- Gymnastics Schools, Rockville
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