- Machine Shop & Tool Repair Service, Holyoke
- Machinery, Supplies & Equipment - Business Production Related, Holyoke
- Machinery, Supplies & Equipment - Business Supplies Related, Holyoke
- Machinery, Supplies & Equipment - Construction & Contractor Related, Holyoke
- Magazine & Newspaper Stands, Holyoke - Dealers & Distributors
- Major Appliance Repair & Service, Holyoke
- Major Appliances, Holyoke - Household & Kitchen
- Malls & Shopping Centers, Holyoke
- Management Consultants & Services, Holyoke
- Manicurists & Pedicurists, Holyoke
- Manufacturers Agents & Representatives, Holyoke
- Manufacturers Representative, Holyoke - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Holyoke
- Manufacturing Products, Holyoke
- Marriage & Family Counselors, Holyoke
- Martial Arts & Self Defense Schools, Holyoke
- Masonry Contractors, Holyoke - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Holyoke
- Massage Therapy, Holyoke
- Material Handling Equipment, Holyoke - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Holyoke - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Holyoke
- Medical Billing Services, Holyoke
- Medical Groups & Clinics, Holyoke - Medical & Health Centers
- Medical Supplies & Equipment, Holyoke
- Membership Sports & Recreation Clubs, Holyoke
- Men's Clothing Stores, Holyoke - Clothes & Accessories
- Mental Health Clinics, Holyoke - Treatment Centers
- Mental Health Specialists, Holyoke - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Coating & Allied Services, Holyoke
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- Metal Plating & Polishing, Holyoke
- Metal Repair Service & Blacksmith, Holyoke - Iron Works
- Mexican Restaurants, Holyoke
- Millwork Contractors, Holyoke
- Mini Golf Courses, Holyoke
- Mirrors, Holyoke - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Holyoke
- Miscellaneous Government, Holyoke
- Miscellaneous Industry, Holyoke
- Miscellaneous Jewelry, Holyoke
- Miscellaneous Manufacturing, Holyoke
- Miscellaneous Personal Services, Holyoke
- Miscellaneous Photographers, Holyoke
- Miscellaneous Professional, Holyoke
- Money Transfer Service, Holyoke
- Monuments, Tombstones, Markers & Memorials, Holyoke
- Mortgage Bankers & Correspondents, Holyoke
- Motor Vehicle, Holyoke
- Motor Vehicle Rental & Leasing, Holyoke
- Moving Companies, Holyoke
- Moving Truck Rental , Holyoke
- Muffler Shop & Exhaust Systems, Holyoke
- Museums, Holyoke
- Music, Holyoke
- Music Lessons, Holyoke
- Music Lessons - Vocal, Holyoke
- Music Publishers & Distribution, Holyoke
- Musical Instruments & Equipment Stores, Holyoke
- Musical Instruments Repair, Sales & Service, Holyoke
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