- Accounting, Auditing & Bookkeeping Services, Walkerton
- Advertising, PR & Marketing Services, Walkerton
- Agricultural Insurance, Walkerton
- Agriculture, Walkerton
- Air Conditioning Repair & Service, Walkerton - HVAC - Cooling & Heating Repair
- Alarms, Signaling & Security Equipment & Systems, Walkerton
- Alcohol & Drug Prevention Education, Walkerton
- Ambulance Department, Walkerton
- American Legions, Walkerton
- Animal Hospitals, Walkerton - Veterinary Clinic & Hospital
- Antique Stores, Walkerton - Antique Mall, Dealers & Shops
- Apartment Building Operators, Walkerton
- Apartment Management, Walkerton
- Apartments & Buildings, Walkerton
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- Apartments & Rental Apartments Operators, Walkerton
- Arts & Culture, Walkerton
- Asian Restaurants, Walkerton
- Attorneys & Lawyers, Walkerton
- Attorneys & Lawyers, Walkerton
- Auctioneer, Walkerton
- Audio Video Repair & Service, Walkerton
- Auto Body Repair & Paint Shop, Walkerton - Auto Body Shop
- Auto Parts Stores - Used & Rebuilt, Walkerton - Truck, Car Parts, etc
- Auto Parts, Accessories, Equipment & Supplies, Walkerton
- Auto Repair Shops & Maintenance Service, Walkerton - Auto Mechanic & Car Repair Shops
- Auto Repair Shops - General, Walkerton
- Auto Restoration - Antique, Sports & Classic Car, Walkerton
- Auto Services, Walkerton
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