- Machine Shop, Watertown
- Machine Shop & Tool Repair Service, Watertown
- Machinery, Supplies & Equipment - Business Production Related, Watertown
- Machinery, Supplies & Equipment - Business Supplies Related, Watertown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Watertown
- Magazine & Newspaper Stands, Watertown - Dealers & Distributors
- Mail Delivery Service, Watertown
- Major Appliances, Watertown - Household & Kitchen
- Malls & Shopping Centers, Watertown
- Management Consultants & Services, Watertown
- Manicurists & Pedicurists, Watertown
- Manifold Business Forms Manufacturers, Watertown
- Manufactured & Mobile Home Movers & Transporting, Watertown
- Manufacturers Agents & Representatives, Watertown
- Manufacturers Representative, Watertown - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Watertown
- Manufacturing & Industrial Consultants, Watertown
- Manufacturing Products, Watertown
- Marine Electronic Equipment, Watertown
- Marine Supplies & Equipment, Watertown - Boat Supplies
- Marriage & Family Counselors, Watertown
- Martial Arts & Self Defense Schools, Watertown
- Masonry Contractors, Watertown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Watertown
- Massage Therapists & Professional, Watertown
- Massage Therapy, Watertown
- Mechanical Contractors, Watertown - Install, Service & Repair
- Medical & Dental Management, Watertown
- Medical Management & Business Administration Service, Watertown
- Medical Supplies & Equipment, Watertown
- Membership Sports & Recreation Clubs, Watertown
- Men's Clothing Stores, Watertown - Clothes & Accessories
- Mennonite Church, Watertown
- Mental Health Specialists, Watertown - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Watertown - Kits, Homes, Steel Buildings, etc
- Metaphysical Churches, Watertown
- Methodist Church, Watertown
- Mexican Restaurants, Watertown
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- Milk & Milk Products, Watertown
- Mining, Watertown
- Mining Services, Watertown
- Miscellaneous Household Item Repair, Watertown
- Miscellaneous Prosthesis & Appliances, Watertown
- Miscellaneous Business Services, Watertown
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Watertown
- Miscellaneous Government, Watertown
- Miscellaneous Manufacturing, Watertown
- Miscellaneous Personal Services, Watertown
- Miscellaneous Photographers, Watertown
- Miscellaneous Professional, Watertown
- Mobile Home Contractors, Watertown
- Mobile Home Improvements & Repairs, Watertown
- Mobile Home Parks & Communities , Watertown
- Modular & Mobile Homes For Sale, Watertown - Manufactured Homes Sale & Service
- Monuments Cleaning, Watertown
- Monuments, Tombstones, Markers & Memorials, Watertown
- Mortgage Bankers & Correspondents, Watertown
- Mortgages & Loans, Watertown
- Motion Picture Pre & Post Production Services, Watertown
- Motor Vehicle, Watertown
- Motor Vehicle Rental & Leasing, Watertown
- Motorcycle & Motor Scooters Dealers, Repair & Service, Watertown
- Motorcycle Parts, Accessories & Dealers, Watertown
- Motorcycle Repair & Service, Watertown
- Movie Theaters, Watertown
- Moving Companies, Watertown
- Moving Supplies & Equipment Rental, Watertown
- Moving Truck Rental , Watertown
- Muffler Shop & Exhaust Systems, Watertown
- Mulch, Peat & Moss Products, Watertown
- Museums, Watertown
- Music, Watertown
- Music Lessons, Watertown
- Music Lessons - Instrumental, Watertown
- Musical Instruments & Equipment Stores, Watertown
- Musical Instruments Repair, Sales & Service, Watertown
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