- Machine Shop, Walkerton
- Machine Shop & Tool Repair Service, Walkerton
- Machinery Movers & Erectors, Walkerton
- Machinery, Supplies & Equipment - Business Production Related, Walkerton
- Machinery, Supplies & Equipment - Business Supplies Related, Walkerton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Walkerton
- Magazine & Newspaper Stands, Walkerton - Dealers & Distributors
- Mailing, Delivery & Courier Service, Walkerton
- Maintenance, Cleaning & Sanitation, Walkerton
- Major Appliances, Walkerton - Household & Kitchen
- Management Consultants & Services, Walkerton
- Manufacturing, Walkerton
- Manufacturing Products, Walkerton
- Marble, Walkerton
- Masonry Materials & Supplies, Walkerton
- Massage Therapists & Professional, Walkerton
- Massage Therapy, Walkerton
- Meat Market, Wholesale & Products, Walkerton
|
- Medical Alert Systems, Walkerton - Medical Alarms - PERS
- Medical Supplies & Equipment, Walkerton
- Membership Sports & Recreation Clubs, Walkerton
- Men's Clothing Stores, Walkerton - Clothes & Accessories
- Mental Health Specialists, Walkerton - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Walkerton
- Miscellaneous Agriculture, Walkerton
- Miscellaneous Government, Walkerton
- Miscellaneous Industry, Walkerton
- Miscellaneous Professional, Walkerton
- Modular Buildings, Walkerton - Modular Homes Buildings & Offices
- Monuments, Tombstones, Markers & Memorials, Walkerton
- Mortgage Bankers & Correspondents, Walkerton
- Motor Vehicle, Walkerton
- Motor Vehicle Rental & Leasing, Walkerton
- Moving Companies, Walkerton
- Moving Truck Rental , Walkerton
|