- Machine Shop, Peterborough
- Machine Shop & Tool Repair Service, Peterborough
- Machine Tools , Peterborough
- Machinery And Equipment Manufacturers, Peterborough
- Machinery Repair & Rebuild, Peterborough
- Machinery, Supplies & Equipment - Business Production Related, Peterborough
- Machinery, Supplies & Equipment - Business Supplies Related, Peterborough
- Machinery, Supplies & Equipment - Construction & Contractor Related, Peterborough
- Magazine & Newspaper Stands, Peterborough - Dealers & Distributors
- Magazine Ads, Peterborough - Periodical Advertising
- Magnetic Devices, Peterborough
- Magnets & Magnetic Devices, Peterborough
- Mail Delivery Service, Peterborough
- Mailboxes Retail, Peterborough
- Mailing List Service, Brokers & Compilers, Peterborough
- Mailing, Delivery & Courier Service, Peterborough
- Maintenance, Cleaning & Sanitation, Peterborough
- Major Appliances, Peterborough - Household & Kitchen
- Make Up & Cosmetics Application, Peterborough
- Malls & Shopping Centers, Peterborough
- Management Consultants & Services, Peterborough
- Management Training & Development, Peterborough
- Manicurists & Pedicurists, Peterborough
- Manufactured & Mobile Home Movers & Transporting, Peterborough
- Manufacturers Agents & Representatives, Peterborough
- Manufacturers Representative, Peterborough - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Peterborough
- Manufacturing Products, Peterborough
- Marinas & Marina Services, Peterborough
- Marine & Boat Products, Peterborough
- Marine Contractors & Designers, Peterborough
- Marine Products And Services, Peterborough
- Marine Services, Peterborough
- Marine Supplies & Equipment, Peterborough - Boat Supplies
- Market Research & Analysis , Peterborough - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Peterborough
- Martial Arts & Self Defense Schools, Peterborough
- Masonry Contractors, Peterborough - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Peterborough
- Massage Therapists & Professional, Peterborough
- Massage Therapy, Peterborough
- Massage Therapy Relaxation, Peterborough
- Mastectomy Apparel, Forms, Prostheses & Supplies, Peterborough
- Material Handling & Heavy Machinery & Equipment, Peterborough
- Material Handling Equipment, Peterborough - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Peterborough - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Packers, Peterborough
- Mechanical Contractors, Peterborough - Install, Service & Repair
- Medical & Health Service Organizations, Peterborough
- Medical Alert Systems, Peterborough - Medical Alarms - PERS
- Medical Research Facilities, Peterborough - Research & Development Centers
- Medical Supplies & Equipment, Peterborough
- Meeting & Event Planning Services, Peterborough - Conference Consultants
- Membership Sports & Recreation Clubs, Peterborough
- Men's & Boys Clothing & Accessories Stores, Peterborough
- Men's Clothing Stores, Peterborough - Clothes & Accessories
- Men's Shoe Stores, Peterborough
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- Mens & Boys Jeans & Western Wear Stores, Peterborough
- Mental Health Specialists, Peterborough - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Peterborough - Message Receiving & Forwarding Service
- Metal Repair Service & Blacksmith, Peterborough - Iron Works
- Metal Services, Peterborough
- Metal Specialties, Peterborough
- Metaphysical Churches, Peterborough
- Methodist Church, Peterborough
- Mexican Restaurants, Peterborough
- Middle Eastern Restaurants, Peterborough
- Midwives, Peterborough
- Mildew Removal & Control, Peterborough - Mold Removal
- Mini & Self Storage, Peterborough
- Mini Golf Courses, Peterborough
- Mining, Peterborough
- Mirrors, Peterborough - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Peterborough
- Miscellaneous Household Item Repair, Peterborough
- Miscellaneous Prosthesis & Appliances, Peterborough
- Miscellaneous Agriculture, Peterborough
- Miscellaneous Business Services, Peterborough
- Miscellaneous Government, Peterborough
- Miscellaneous Industry, Peterborough
- Miscellaneous Manufacturing, Peterborough
- Miscellaneous Personal Services, Peterborough
- Miscellaneous Photographers, Peterborough
- Miscellaneous Professional, Peterborough
- Mobile Home Parks & Communities , Peterborough
- Moldings Materials, Peterborough
- Molds Manufacturers, Peterborough
- Money Transfer Service, Peterborough
- Monuments, Tombstones, Markers & Memorials, Peterborough
- Mortgage Bankers & Correspondents, Peterborough
- Mortgage Brokers, Peterborough
- Motion Picture & Television Production Services, Peterborough
- Motion Picture Pre & Post Production Services, Peterborough
- Motivational Speakers & Consultants, Peterborough - Speakers, Lectures & Seminars
- Motor Vehicle, Peterborough
- Motor Vehicle Rental & Leasing, Peterborough
- Motorcycle Parts, Accessories & Dealers, Peterborough
- Motorcycle Wreckers, Peterborough
- Mountain & Ice Climbing Tours, Peterborough
- Movie Theaters, Peterborough
- Moving & Storage Supplies & Equipment, Peterborough
- Moving Companies, Peterborough
- Moving Truck Rental , Peterborough
- Muffler Shop & Exhaust Systems, Peterborough
- Multimedia Publishers, Peterborough - Multimedia Services & Systems
- Museums, Peterborough
- Music, Peterborough
- Music Entertainment, Peterborough
- Music Lessons, Peterborough
- Music Lessons - Instrumental, Peterborough
- Musical Instruments & Equipment Stores, Peterborough
- Musical Instruments Repair, Sales & Service, Peterborough
- Musical Recording Services, Peterborough
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