- Games & Hobbies, Brewster
- Garbage & Rubbish Removal, Brewster
- Garment & Linen Services, Brewster
- Gas Companies, Brewster
- Gas Engine, Brewster
- Gas Station, Brewster - Service & Filling Station
- Gemologists & Jewelers, Brewster
- General Business Consulting, Brewster
- General Business Services, Brewster
- General Consultants, Brewster
- General Freight Trucking, Brewster - Motor Freight
- General Management Consulting Services, Brewster - Management Consultants
- General Merchandise Stores, Brewster
- General Travel Agents & Agencies, Brewster
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- Generators, Compressors, Pumps, Motors & Fans, Brewster
- Gift Shops, Brewster - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Brewster
- Glass & Glass Products, Brewster
- Glass - Auto, Float, Plate, Window & Doors, Brewster
- Glass - Beveled, Carved, Etched & Ornamental, Brewster
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Brewster
- Golf Courses, Brewster
- Government, Brewster
- Grocery Stores & Supermarkets, Brewster
- Ground Transportation, Except Passenger, Brewster
- Group Homes, Brewster
- Gymnastics Schools, Brewster
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