- Games & Hobbies, Waterloo
- Garbage & Rubbish Removal, Waterloo
- Garment & Linen Services, Waterloo
- Gas Station, Waterloo - Service & Filling Station
- Gastroenterologists, Waterloo - GI Doctors, Physicians & Surgeons (Gastroenterology)
- General Business Services, Waterloo
- General Freight Trucking, Waterloo - Motor Freight
- General Management Consulting Services, Waterloo - Management Consultants
- General Merchandise Stores, Waterloo
- General Travel Agents & Agencies, Waterloo
- Geothermal Heating & Cooling Contractors, Waterloo - Geothermal HVAC - Installation
- German Restaurants, Waterloo
- Gift Shops, Waterloo - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Waterloo
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- Glass & Glass Products, Waterloo
- Glass & Glazing Contractors, Waterloo
- Glass - Auto, Float, Plate, Window & Doors, Waterloo
- Glass Tinting & Coating, Waterloo - Home - Car Window Tinting
- Golf Courses, Waterloo
- Golf Equipment Repair & Sales, Waterloo - Clubs, Carts, Bags & More
- Gospel Church, Waterloo
- Government, Waterloo
- Grocery Stores & Supermarkets, Waterloo
- Ground Transportation, Except Passenger, Waterloo
- Gun Repair & Services, Waterloo
- Guns & Gunsmith Services, Waterloo
- Gutters & Downspout Cleaning & Repairing, Waterloo
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