- Gambling & Lottery Services, Waterville
- Games & Hobbies, Waterville
- Garage Doors & Door Operating Devices, Waterville
- Garage Doors & Gates, Waterville - Stores & Companies - Install & Repair Services
- Garage, Door & Window Products, Waterville
- Garbage & Rubbish Removal, Waterville
- Garment & Linen Services, Waterville
- Gas Station, Waterville - Service & Filling Station
- General Business Consulting, Waterville
- General Business Services, Waterville
- General Consultants, Waterville
- General Merchandise Stores, Waterville
- General Surgeons, Waterville - General Surgery Doctors, Physicians & Surgeons
- General Travel Agents & Agencies, Waterville
- Gift Shops, Waterville - Gift, Novelty & Souvenir Stores
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- Gifts, Cards & Stationery Stores, Waterville
- Glass & Glass Products, Waterville
- Glass - Auto, Float, Plate, Window & Doors, Waterville
- Glass Stained & Leaded, Waterville
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Waterville
- Golf Courses, Waterville
- Gourmet Food Stores, Waterville
- Gourmet Restaurants, Waterville
- Government, Waterville
- Government And Administration Attorneys & Lawyers, Waterville
- Government And Administration Attorneys & Lawyers, Waterville
- Government And Administration Lawyers & Attorneys, Waterville
- Greeting Card Stores, Waterville
- Grocery Stores & Supermarkets, Waterville
- Ground Transportation, Except Passenger, Waterville
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