- Machine Shop, West Springfield
- Machine Shop & Tool Repair Service, West Springfield
- Machine Shop Rotary Surface Grinding, West Springfield - Tool Grinding & Sharpening
- Machine Tools Manufacturers Metal Cutting Types, West Springfield
- Machinery And Equipment Manufacturers, West Springfield
- Machinery, Supplies & Equipment - Business Production Related, West Springfield
- Machinery, Supplies & Equipment - Business Supplies Related, West Springfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, West Springfield
- Mailbox Rental Services, West Springfield
- Mailing, Delivery & Courier Service, West Springfield
- Major Appliances, West Springfield - Household & Kitchen
- Management Consultants & Services, West Springfield
- Manicurists & Pedicurists, West Springfield
- Manufacturers Agents & Representatives, West Springfield
- Manufacturers Representative, West Springfield - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, West Springfield
- Manufacturing Products, West Springfield
- Marble, West Springfield
- Marine Supplies & Equipment, West Springfield - Boat Supplies
- Marriage & Family Counselors, West Springfield
- Martial Arts & Self Defense Schools, West Springfield
- Masonry Contractors, West Springfield - Stone Mason, Brick Mason - Install & Repair
- Masonry Contractors Commercial & Industrial, West Springfield
- Masonry Materials & Supplies, West Springfield
- Massage Therapists & Professional, West Springfield
- Massage Therapy, West Springfield
- Material Handling Equipment, West Springfield - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, West Springfield
- Mechanical Contractors, West Springfield - Install, Service & Repair
- Mechanical Engineer, West Springfield - Mechanical Engineering Service
- Medical & Dental Management, West Springfield
- Medical Management & Business Administration Service, West Springfield
- Medical Supplies & Equipment, West Springfield
- Membership Sports & Recreation Clubs, West Springfield
- Men's & Boys Clothing & Accessories Stores, West Springfield
- Men's Clothing Stores, West Springfield - Clothes & Accessories
- Men's Shoe Stores, West Springfield
- Mens & Boys Jeans & Western Wear Stores, West Springfield
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- Mental Health Clinics, West Springfield - Treatment Centers
- Mental Health Specialists, West Springfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, West Springfield
- Metal Finishers, West Springfield
- Metal Plating & Polishing, West Springfield
- Metal Products, West Springfield
- Metal Repair Service & Blacksmith, West Springfield - Iron Works
- Methodist Church, West Springfield
- Mexican Restaurants, West Springfield
- Microwave Oven Repair & Service, West Springfield
- Middle Eastern Restaurants, West Springfield
- Mini Golf Courses, West Springfield
- Mining, West Springfield
- Miscellaneous Household Item Repair, West Springfield
- Miscellaneous Business Services, West Springfield
- Miscellaneous Government, West Springfield
- Miscellaneous Industry, West Springfield
- Miscellaneous Manufacturing, West Springfield
- Miscellaneous Personal Services, West Springfield
- Miscellaneous Professional, West Springfield
- Mobile Home Parks & Communities , West Springfield
- Money Transfer Service, West Springfield
- Monuments, Tombstones, Markers & Memorials, West Springfield
- Mortgage Bankers & Correspondents, West Springfield
- Motion Picture & Television Production Services, West Springfield
- Motion Picture Dists & Producers, West Springfield
- Motor Vehicle, West Springfield
- Motor Vehicle Rental & Leasing, West Springfield
- Motorcycle & Motor Scooters Dealers, Repair & Service, West Springfield
- Motorcycle Repair & Service, West Springfield
- Movie Theaters, West Springfield
- Moving & Storage Supplies & Equipment, West Springfield
- Moving Companies, West Springfield
- Moving Truck Rental , West Springfield
- Muffler Shop & Exhaust Systems, West Springfield
- Museums, West Springfield
- Music, West Springfield
- Musical Instruments & Equipment Stores, West Springfield
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