- Machine Shop & Tool Repair Service, Springfield
- Machinery, Supplies & Equipment - Business Production Related, Springfield
- Machinery, Supplies & Equipment - Business Supplies Related, Springfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Springfield
- Magazine & Newspaper Stands, Springfield - Dealers & Distributors
- Mail Delivery Service, Springfield
- Mailbox Rental Services, Springfield
- Mailing, Delivery & Courier Service, Springfield
- Maintenance, Cleaning & Sanitation, Springfield
- Major Appliances, Springfield - Household & Kitchen
- Malls & Shopping Centers, Springfield
- Management Consultants & Services, Springfield
- Management Training & Development, Springfield
- Manicurists & Pedicurists, Springfield
- Manufacturers Agents & Representatives, Springfield
- Manufacturers Representative, Springfield - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Springfield
- Manufacturing Products, Springfield
- Marble, Springfield
- Marble & Terrazzo Flooring - Cleaning & Service, Springfield
- Marine Contractors & Designers, Springfield
- Marine Engineers, Springfield
- Markets & Grocers Equipment, Springfield
- Marriage & Family Counselors, Springfield
- Martial Arts & Self Defense Schools, Springfield
- Masonry Contractors, Springfield - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Springfield
- Massage Therapists & Professional, Springfield
- Massage Therapy, Springfield
- Material Handling & Heavy Machinery & Equipment, Springfield
- Maternity Clothes & Clothing Stores, Springfield - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Springfield
- Mechanical Contractors, Springfield - Install, Service & Repair
- Mechanical Engineer, Springfield - Mechanical Engineering Service
- Medical & Dental Management, Springfield
- Medical & Health Service Organizations, Springfield
- Medical Diagnostic Clinics, Springfield - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Springfield
- Medical Groups & Clinics, Springfield - Medical & Health Centers
- Medical Supplies & Equipment, Springfield
- Membership Sports & Recreation Clubs, Springfield
- Men's & Boys Clothing & Accessories Stores, Springfield
- Men's Clothing Stores, Springfield - Clothes & Accessories
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- Mens & Boys Belts & Suspenders, Springfield
- Mental Health Specialists, Springfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Springfield - Message Receiving & Forwarding Service
- Metal Buildings, Springfield - Kits, Homes, Steel Buildings, etc
- Metal Finishers, Springfield
- Metal Plating & Polishing, Springfield
- Metal Repair Service & Blacksmith, Springfield - Iron Works
- Metallurgical Testing Labs, Springfield
- Methodist Church, Springfield
- Mexican Restaurants, Springfield
- Mildew Removal & Control, Springfield - Mold Removal
- Millwork Contractors, Springfield
- Mini & Self Storage, Springfield
- Mining, Springfield
- Ministries Church, Springfield
- Miscellaneous Business Product Repair, Springfield
- Miscellaneous Household Item Repair, Springfield
- Miscellaneous Business Services, Springfield
- Miscellaneous Government, Springfield
- Miscellaneous Manufacturing, Springfield
- Miscellaneous Personal Services, Springfield
- Miscellaneous Photographers, Springfield
- Miscellaneous Professional, Springfield
- Money Transfer Service, Springfield
- Mortgage Bankers & Correspondents, Springfield
- Mortgage Contracts & Services, Springfield
- Mortgages & Loans, Springfield
- Motion Picture & Television Production Services, Springfield
- Motion Picture Pre & Post Production Services, Springfield
- Motor Vehicle, Springfield
- Motor Vehicle Rental & Leasing, Springfield
- Motorcycle Parts, Accessories & Dealers, Springfield
- Movie Theaters, Springfield
- Moving & Storage Supplies & Equipment, Springfield
- Moving Companies, Springfield
- Moving Supplies & Equipment Rental, Springfield
- Moving Truck Rental , Springfield
- Muffler Shop & Exhaust Systems, Springfield
- Music, Springfield
- Musical Instruments & Equipment Stores, Springfield
- Musical Recording Services, Springfield
- Myofunctional Therapy, Springfield
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