- Machine Shop & Tool Repair Service, Petrolia
- Machinery, Supplies & Equipment - Business Production Related, Petrolia
- Machinery, Supplies & Equipment - Construction & Contractor Related, Petrolia
- Management Consultants & Services, Petrolia
- Manicurists & Pedicurists, Petrolia
- Manufacturing, Petrolia
- Manufacturing Products, Petrolia
- Marriage & Family Counselors, Petrolia
- Martial Arts & Self Defense Schools, Petrolia
- Masonry Contractors, Petrolia - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Petrolia
- Massage Therapists & Professional, Petrolia
- Massage Therapy, Petrolia
- Mats & Matting, Petrolia
- Meat Packers, Petrolia
- Medical Supplies & Equipment, Petrolia
- Men's & Boys Clothing & Accessories Stores, Petrolia
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- Men's Clothing Stores, Petrolia - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Petrolia
- Mental Health Specialists, Petrolia - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Petrolia
- Metal Repair Service & Blacksmith, Petrolia - Iron Works
- Mini & Self Storage, Petrolia
- Mining, Petrolia
- Miscellaneous Government, Petrolia
- Miscellaneous Photographers, Petrolia
- Miscellaneous Professional, Petrolia
- Mortgage Bankers & Correspondents, Petrolia
- Motion Picture Pre & Post Production Services, Petrolia
- Motor Vehicle, Petrolia
- Movie Theaters, Petrolia
- Moving Companies, Petrolia
- Muffler Shop & Exhaust Systems, Petrolia
- Museums, Petrolia
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