- Machine Shop & Tool Repair Service, Duluth
- Machinery And Equipment Manufacturers, Duluth
- Machinery Repair & Rebuild, 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
- Magnetic & Optical Recording Media Manufacturers, Duluth
- Mail Boxes Manufacturers, 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
- Management Consultants & Services, Duluth
- Mandarin Restaurants, Duluth
- Manicurists & Pedicurists, Duluth
- Manifold Business Forms Manufacturers, Duluth
- Manufacturers Agents & Representatives, Duluth
- Manufacturers Representative, Duluth - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Duluth
- Manufacturing & Industrial Consultants, Duluth
- Manufacturing Equipment & Supplies, Duluth
- Manufacturing Products, Duluth
- Marble, Duluth
- Mariachis, Duluth
- Marriage & Family Counselors, Duluth
- Martial Arts & Self Defense Schools, Duluth
- Masonry Contractors, Duluth - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Duluth
- Massage Therapy, Duluth
- Material Handling, Duluth
- Material Handling & Heavy Machinery & Equipment, Duluth
- Material Handling Consultants, Duluth
- Mausoleums Developers, Duluth
- Meat Market, Wholesale & Products, Duluth
- Meat Packers, Duluth
- Mechanical Contractors, Duluth - Install, Service & Repair
- Medical & Dental Assistant Schools, Duluth
- Medical & Dental Management, Duluth
- Medical & Health Service Organizations, Duluth
- Medical Diagnostic Clinics, Duluth - Clinical Labs & Centers
- Medical Identification Jewelry, Duluth
- Medical Management & Business Administration Service, Duluth
- Medical Records Service , Duluth
- Medical Research, Duluth
- Medical Research & Development, Duluth - Medical Information & Research
- 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
- Men's Shoe Stores, Duluth
- Mens & Boys Belts & Suspenders, Duluth
- Mens & Boys Jeans & Western Wear Stores, Duluth
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- Mental Health Clinics, Duluth - Treatment Centers
- Mental Health Specialists, Duluth - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Duluth
- Merchandising & Marketing Consultants, Duluth
- Metal Boxes & Containers, Duluth
- Metal Buildings, Duluth - Kits, Homes, Steel Buildings, etc
- Metal Plating & Polishing, Duluth
- Metal Products, Duluth
- Methodist Church, Duluth
- Mexican Restaurants, Duluth
- Middle Eastern Restaurants, Duluth
- Mildew Removal & Control, Duluth - Mold Removal
- Mini & Self Storage, Duluth
- Mini Golf Courses, Duluth
- Mining, Duluth
- Mining Contractors, Duluth - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Duluth - Mining Companies
- Ministries Church, 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
- Money Transfer Service, Duluth
- Monuments, Tombstones, Markers & Memorials, Duluth
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Duluth
- Mortgage Bankers & Correspondents, Duluth
- Mortgages & Loans, Duluth
- Motion Picture & Television Production Services, Duluth
- Motion Picture Dists & Producers, Duluth
- Motion Picture Dists Exchanges & Representatives, Duluth
- Motion Picture Pre & Post Production Services, Duluth
- Motion Pictures Video Tape Duplication & Transfer Services, Duluth
- Motor Homes Renting & Leasing, Duluth
- Motor Vehicle, Duluth
- Motor Vehicle Rental & Leasing, Duluth
- Motorcycle Parts, Accessories & Dealers, 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 Lessons, Duluth
- Music Lessons - Instrumental, Duluth
- Musical Instrument Rental, Duluth - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Duluth
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