- Machine Shop & Tool Repair Service, Bowmanville
- Machinery Movers & Erectors, Bowmanville
- Machinery Repair & Rebuild, Bowmanville
- Machinery, Supplies & Equipment - Business Production Related, Bowmanville
- Machinery, Supplies & Equipment - Business Supplies Related, Bowmanville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Bowmanville
- Magazine & Newspaper Stands, Bowmanville - Dealers & Distributors
- Mailboxes Retail, Bowmanville
- Mailing, Delivery & Courier Service, Bowmanville
- Make Up & Cosmetics Application, Bowmanville
- Management Consultants & Services, Bowmanville
- Manicurists & Pedicurists, Bowmanville
- Manufactured & Mobile Home Movers & Transporting, Bowmanville
- Manufacturers Agents & Representatives, Bowmanville
- Manufacturers Representative, Bowmanville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Bowmanville
- Manufacturing Products, Bowmanville
- Marinas & Marina Services, Bowmanville
- Marriage & Family Counselors, Bowmanville
- Martial Arts & Self Defense Schools, Bowmanville
- Masonry Contractors, Bowmanville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Bowmanville
- Massage Parlor & Steam Bath Services, Bowmanville
- Massage Therapists & Professional, Bowmanville
- Massage Therapy, Bowmanville
- Medical & Dental Management, Bowmanville
- Medical Management & Business Administration Service, Bowmanville
- Medical Supplies & Equipment, Bowmanville
- Membership Sports & Recreation Clubs, Bowmanville
- Men's Clothing Stores, Bowmanville - Clothes & Accessories
- Mental Health Specialists, Bowmanville - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Bowmanville - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Bowmanville - Iron Works
- Mexican Restaurants, Bowmanville
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- Microwave Ovens, Bowmanville
- Millwork Manufacturers, Bowmanville
- Millwrights, Bowmanville
- Minerals, Bowmanville
- Mini & Self Storage, Bowmanville
- Mini Golf Courses, Bowmanville
- Mirrors, Bowmanville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Bowmanville
- Miscellaneous Agriculture, Bowmanville
- Miscellaneous Business Services, Bowmanville
- Miscellaneous Government, Bowmanville
- Miscellaneous Manufacturing, Bowmanville
- Miscellaneous Personal Services, Bowmanville
- Miscellaneous Photographers, Bowmanville
- Miscellaneous Professional, Bowmanville
- Modular Buildings, Bowmanville - Modular Homes Buildings & Offices
- Money Transfer Service, Bowmanville
- Monuments, Tombstones, Markers & Memorials, Bowmanville
- Mortgage Bankers & Correspondents, Bowmanville
- Mortgage Brokers, Bowmanville
- Motor Vehicle, Bowmanville
- Motor Vehicle Rental & Leasing, Bowmanville
- Motorcycle Parts, Accessories & Dealers, Bowmanville
- Movie Theaters, Bowmanville
- Moving & Storage Supplies & Equipment, Bowmanville
- Moving Companies, Bowmanville
- Moving Truck Rental , Bowmanville
- Muffler Shop & Exhaust Systems, Bowmanville
- Museums, Bowmanville
- Music, Bowmanville
- Music Lessons, Bowmanville
- Music Lessons - Instrumental, Bowmanville
- Musical Instruments & Equipment Stores, Bowmanville
- Musical Instruments Repair, Sales & Service, Bowmanville
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