- Games & Hobbies, Port Perry
- Garbage & Rubbish Removal, Port Perry
- Garment & Linen Services, Port Perry
- Gas Companies, Port Perry
- Gas Station, Port Perry - Service & Filling Station
- General Business Consulting, Port Perry
- General Business Services, Port Perry
- General Consultants, Port Perry
- General Management Consulting Services, Port Perry - Management Consultants
- General Merchandise Stores, Port Perry
- General Travel Agents & Agencies, Port Perry
- Generators, Compressors, Pumps, Motors & Fans, Port Perry
- Gift Baskets, Port Perry
- Gift Shops, Port Perry - Gift, Novelty & Souvenir Stores
- Gifts By Type & Occasion, Port Perry
- Gifts, Cards & Stationery Stores, Port Perry
- Glass & Glass Products, Port Perry
- Glass & Glazing Contractors, Port Perry
- Glass - Auto, Float, Plate, Window & Doors, Port Perry
- Glass Stained & Leaded, Port Perry
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- Glass Tinting & Coating, Port Perry - Home - Car Window Tinting
- Global Restaurant, Port Perry
- Gold, Silver & Platinum Buyers, Sellers & Dealers, Port Perry
- Golf Courses, Port Perry
- Golf Driving Ranges, Port Perry
- Golf Equipment & Supplies Stores, Port Perry - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Port Perry
- Grain Elevators, Port Perry
- Graphic Design Services, Port Perry - Graphic Designer
- Graphic Designer & Artist Services, Port Perry
- Grease & Oil Disposal Sites, Port Perry
- Grills & Grilling Equipment & Supplies, Port Perry
- Grocery Stores & Supermarkets, Port Perry
- Ground Transportation, Except Passenger, Port Perry
- Gun & Hunting & Fishing Clubs, Port Perry
- Gun Repair & Services, Port Perry
- Guns & Gunsmith Services, Port Perry
- Gutter & Flashing Contractors, Port Perry - Metal - Copper Flashing - Gutter Cleaning & Repair Services
- Gymnastics Equipment & Supplies, Port Perry
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