- Machine Shop, Port Townsend
- Machine Shop & Tool Repair Service, Port Townsend
- Machine Tools , Port Townsend
- Machinery, Supplies & Equipment - Business Production Related, Port Townsend
- Machinery, Supplies & Equipment - Business Supplies Related, Port Townsend
- Machinery, Supplies & Equipment - Construction & Contractor Related, Port Townsend
- Magicians & Hypnotist Entertainers, Port Townsend
- Mailbox Rental Services, Port Townsend
- Mailing, Delivery & Courier Service, Port Townsend
- Major Appliances, Port Townsend - Household & Kitchen
- Malls & Shopping Centers, Port Townsend
- Management Consultants & Services, Port Townsend
- Manicurists & Pedicurists, Port Townsend
- Manufacturers Agents & Representatives, Port Townsend
- Manufacturers Representative, Port Townsend - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Port Townsend
- Manufacturing Equipment & Supplies, Port Townsend
- Manufacturing Products, Port Townsend
- Marinas & Marina Services, Port Townsend
- Marine Communication Equipment Manufacturers, Port Townsend
- Marine Contractors & Designers, Port Townsend
- Marine Electronic Equipment, Port Townsend
- Marine Lifts, Launching & Recovery, Port Townsend
- Marine Products And Services, Port Townsend
- Marine Repair & Service Stations, Port Townsend
- Marine Supplies & Equipment, Port Townsend - Boat Supplies
- Marine Supplies & Equipment Repair, Port Townsend - Boat Supplies & Equipment
- Marriage & Family Counselors, Port Townsend
- Martial Arts & Self Defense Schools, Port Townsend
- Masonry Contractors, Port Townsend - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Port Townsend
- Massage Therapists & Professional, Port Townsend
- Massage Therapy, Port Townsend
- Material Handling & Heavy Machinery & Equipment, Port Townsend
- Mechanical Engineer, Port Townsend - Mechanical Engineering Service
- Medical & Dental Management, Port Townsend
- Medical Supplies & Equipment, Port Townsend
- Meeting & Event Planning Services, Port Townsend - Conference Consultants
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- Men's Clothing Stores, Port Townsend - Clothes & Accessories
- Mental Health Specialists, Port Townsend - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Port Townsend - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Port Townsend - Iron Works
- Metaphysical Churches, Port Townsend
- Methodist Church, Port Townsend
- Mexican Restaurants, Port Townsend
- Middle Eastern Restaurants, Port Townsend
- Midwives, Port Townsend
- Mining, Port Townsend
- Miscellaneous Agriculture, Port Townsend
- Miscellaneous Business Services, Port Townsend
- Miscellaneous Government, Port Townsend
- Miscellaneous Manufacturing, Port Townsend
- Miscellaneous Personal Services, Port Townsend
- Miscellaneous Photographers, Port Townsend
- Miscellaneous Professional, Port Townsend
- Mission Churches, Port Townsend
- Mobile Home Parks & Communities , Port Townsend
- Mortgage Bankers & Correspondents, Port Townsend
- Mortgage Contracts & Services, Port Townsend
- Mortgages & Loans, Port Townsend
- Mortgages Commercial & Industrial, Port Townsend
- Motion Picture & Television Production Services, Port Townsend
- Motor Vehicle, Port Townsend
- Motor Vehicle Rental & Leasing, Port Townsend
- Motorcycle Parts, Accessories & Dealers, Port Townsend
- Movie Theaters, Port Townsend
- Moving & Storage Supplies & Equipment, Port Townsend
- Moving Companies, Port Townsend
- Moving Truck Rental , Port Townsend
- Muffler Shop & Exhaust Systems, Port Townsend
- Museums, Port Townsend
- Music, Port Townsend
- Musical Instrument Rental, Port Townsend - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Port Townsend
- Musical Instruments Repair, Sales & Service, Port Townsend
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