- Machine Shop, Duluth
- Machine Shop & Tool Repair Service, Duluth
- Machine Shops Slings, Duluth
- Machine Tool Repair & Rebuild, Duluth
- Machine Tools , Duluth
- Machinery And Equipment Manufacturers, Duluth
- Machinery, Supplies & Equipment - Business Production Related, Duluth
- Machinery, Supplies & Equipment - Business Supplies Related, Duluth
- Machinery, Supplies & Equipment - Construction & Contractor Related, Duluth
- Magazine & Newspaper Stands, Duluth - Dealers & Distributors
- Mail Delivery Service, Duluth
- Mailbox Rental Services, Duluth
- Mailing List Service, Brokers & Compilers, Duluth
- Mailing, Delivery & Courier Service, Duluth
- Maintenance, Cleaning & Sanitation, Duluth
- Major Appliances, Duluth - Household & Kitchen
- Malls & Shopping Centers, Duluth
- Malpractice Attorneys & Lawyers, Duluth
- Malpractice Attorneys & Lawyers, Duluth
- Malpractice Lawyers & Attorneys, Duluth
- Management Consultants & Services, Duluth
- Management Training & Development, Duluth
- Manicurists & Pedicurists, Duluth
- Manufacturing, Duluth
- Manufacturing Products, Duluth
- Map Publishers & Printers, Duluth
- Mapping & Topographical Services, Duluth
- Maps & Globes, Duluth
- Maps & Supplies, Duluth
- Marinas & Aquariums, Duluth
- Marinas & Marina Services, Duluth
- Marine Animals & Fish, Duluth
- Marine Cargo Handling, Duluth
- Marine Contractors & Designers, Duluth
- Marine Products And Services, Duluth
- Marine Repair & Service Stations, Duluth
- Marine Services, Duluth
- Marine Supplies & Equipment, Duluth - Boat Supplies
- Marine Supplies & Equipment - Boat Engine & Drive Train Repair, Duluth
- Marine Supplies & Equipment Repair, Duluth - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Duluth
- Market Research & Analysis , Duluth - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Duluth
- Martial Arts & Self Defense Schools, Duluth
- Mary Kay Cosmetics, Duluth
- Masonry Contractors, Duluth - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Duluth
- Massage Therapists & Professional, Duluth
- Massage Therapy, Duluth
- Mastectomy Apparel, Forms, Prostheses & Supplies, Duluth
- Material Handling & Heavy Machinery & Equipment, Duluth
- Maternity Clothes & Clothing Stores, Duluth - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Duluth
- Mausoleums Developers, Duluth
- Meat Market, Wholesale & Products, Duluth
- Mechanical Contractors, Duluth - Install, Service & Repair
- Mechanical Engineer, Duluth - Mechanical Engineering Service
- Medical & Dental Management, Duluth
- Medical & Health Service Organizations, Duluth
- Medical Alert Systems, Duluth - Medical Alarms - PERS
- Medical Billing Software, Duluth
- Medical Groups & Clinics, Duluth - Medical & Health Centers
- Medical Management & Business Administration Service, Duluth
- Medical Supplies & Equipment, Duluth
- Meeting & Event Planning Services, Duluth - Conference Consultants
- Membership Sports & Recreation Clubs, Duluth
- Men's & Boys Clothing & Accessories Stores, Duluth
- Men's Clothing Stores, Duluth - Clothes & Accessories
- Mental Health Specialists, Duluth - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Duluth
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- Merchandise Sales Events, Duluth
- Merle Norman Cosmetics, Duluth
- Metal Plating & Polishing, Duluth
- Metal Products, Duluth
- Metal Repair Service & Blacksmith, Duluth - Iron Works
- Metal Services, Duluth
- Metal Tanks, Duluth
- Metaphysical Churches, Duluth
- Methodist Church, Duluth
- Mexican Restaurants, Duluth
- Middle Eastern Restaurants, Duluth
- Midwives, Duluth
- Millwork Contractors, Duluth
- Mini & Self Storage, Duluth
- Miniatures Collectors, Duluth
- Mining, Duluth
- Mining Contractors, Duluth - Mining Companies, Contractors & Brokers
- Mining Development & Exploration, Duluth
- Mining Equipment & Supplies, Duluth
- Mining Services, Duluth
- Mining, Crude-Oil Production, Duluth - Mining Companies
- Mirrors, Duluth - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Duluth
- Miscellaneous Household Item Repair, Duluth
- Miscellaneous Agriculture, Duluth
- Miscellaneous Business Services, Duluth
- Miscellaneous Government, Duluth
- Miscellaneous Industry, Duluth
- Miscellaneous Manufacturing, Duluth
- Miscellaneous Personal Services, Duluth
- Miscellaneous Photographers, Duluth
- Miscellaneous Professional, Duluth
- Mission Churches, Duluth
- Mobile Home Parks & Communities , Duluth
- Modular & Mobile Homes For Sale, Duluth - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Duluth
- Mortgage Bankers & Correspondents, Duluth
- Mortgage Brokers, Duluth
- Mortgage Companies, Duluth
- Mortgage Contracts & Services, Duluth
- Mortgage Feasibility Consultants, Duluth
- Mortgages & Loans, Duluth
- Mortgages Commercial & Industrial, Duluth
- Motion Picture & Television Production Services, Duluth
- Motion Picture Pre & Post Production Services, Duluth
- Motivational Speakers & Consultants, Duluth - Speakers, Lectures & Seminars
- Motor Vehicle, Duluth
- Motor Vehicle Rental & Leasing, Duluth
- Motorcycle & ATV Repair & Service, Duluth
- Motorcycle & Motor Scooters Dealers, Repair & Service, Duluth
- Motorcycle Parts, Accessories & Dealers, Duluth
- Motorcycle Repair & Service, Duluth
- Mountain & Ice Climbing Tours, Duluth
- Mountain & Rock Climbing Instruction, Duluth
- Movie Theaters, Duluth
- Moving & Storage Supplies & Equipment, Duluth
- Moving Companies, Duluth
- Moving Supplies & Equipment Rental, Duluth
- Moving Truck Rental , Duluth
- Muffler Shop & Exhaust Systems, Duluth
- Multimedia Publishers, Duluth - Multimedia Services & Systems
- Museums, Duluth
- Music, Duluth
- Music Entertainment, Duluth
- Music Schools, Duluth
- Musical Instrument Rental, Duluth - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Duluth
- Musical Instruments - Violins, Duluth
- Musical Instruments Repair, Sales & Service, Duluth
- Musicians, Bands & Disc Jockeys, Duluth
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