- Games & Hobbies, Walkerton
- Garbage & Rubbish Removal, Walkerton
- Garment Pressing & Cleaners Agents, Walkerton - Laundries & Dry Cleaners
- Gas Engine, Walkerton
- General Business Services, Walkerton
- General Hardware Stores, Walkerton
- General Merchandise Stores, Walkerton
- General Travel Agents & Agencies, Walkerton
- Geosynthetics, Walkerton
- Gift Shops, Walkerton - Gift, Novelty & Souvenir Stores
- Gifts, Cards & Stationery Stores, Walkerton
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- Glass & Glass Products, Walkerton
- Glass - Auto, Float, Plate, Window & Doors, Walkerton
- Golf Equipment & Supplies Stores, Walkerton - Golf Clubs, Balls, Carts, Bags, Apparel, Shoes & Accessories
- Government, Walkerton
- Grain Elevators, Walkerton
- Granite, Walkerton
- Graphic Design Services, Walkerton - Graphic Designer
- Graphic Designer & Artist Services, Walkerton
- Grocery Stores & Supermarkets, Walkerton
- Ground Transportation, Except Passenger, Walkerton
- Gutter & Flashing Contractors, Walkerton - Metal - Copper Flashing - Gutter Cleaning & Repair Services
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