- Machine Shop & Tool Repair Service, Union
- Machinery And Equipment Manufacturers, Union
- Machinery Custom Design Manufacturers, Union
- Machinery, Supplies & Equipment - Business Production Related, Union
- Machinery, Supplies & Equipment - Business Supplies Related, Union
- Machinery, Supplies & Equipment - Construction & Contractor Related, Union
- Mail Delivery Service, Union
- Mailbox Rental Services, Union
- Mailing, Delivery & Courier Service, Union
- Maintenance, Cleaning & Sanitation, Union
- Major Appliance Repair & Service, Union
- Major Appliances, Union - Household & Kitchen
- Management Consultants & Services, Union
- Manicurists & Pedicurists, Union
- Manifold Business Forms Manufacturers, Union
- Mannequins & Showroom Equipment, Union
- Manufacturers Agents & Representatives, Union
- Manufacturers Representative, Union - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Union
- Manufacturing & Industrial Consultants, Union
- Manufacturing Products, Union
- Marking, Stamping & Engraving Equipment, Union
- Marriage & Family Counselors, Union
- Martial Arts & Self Defense Schools, Union
- Masonry Contractors, Union - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Union
- Massage Therapists & Professional, Union
- Massage Therapy, Union
- Material Handling Equipment, Union - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Union
- Mechanical Contractors, Union - Install, Service & Repair
- Medical & Health Service Organizations, Union
- Medical Billing Services, Union
- Medical Diagnostic Clinics, Union - Clinical Labs & Centers
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Union
- Medical Groups & Clinics, Union - Medical & Health Centers
- Medical Records Service , Union
- Medical Supplies & Equipment, Union
- Medical Transcription Service, Union
- Meeting & Event Planning Services, Union - Conference Consultants
- Membership Sports & Recreation Clubs, Union
- Men's Clothing Stores, Union - Clothes & Accessories
- Men's Shoe Stores, Union
- Mental Health Specialists, Union - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Pricing Equipment, Union
- Metal Distributors, Union
- Metal Lockers, Union
- Metal Powder Products, Union
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- Metal Repair Service & Blacksmith, Union - Iron Works
- Metal Specialties, Union
- Metal Spinning Manufacturers, Union
- Metal Stampings Manufacturers, Union
- Metal Tablets, Union
- Metal Working Machinery, Union
- Methodist Church, Union
- Mexican Restaurants, Union
- Microfilm & Imaging Service, Equipment & Supplies , Union
- Mildew Removal & Control, Union - Mold Removal
- Milk & Milk Products, Union
- Mini & Self Storage, Union
- Mini Golf Courses, Union
- Ministries Church, Union
- Miscellaneous Business Product Repair, Union
- Miscellaneous Household Item Repair, Union
- Miscellaneous Agriculture, Union
- Miscellaneous Business Services, Union
- Miscellaneous Government, Union
- Miscellaneous Manufacturing, Union
- Miscellaneous Metal Work Manufacturers, Union
- Miscellaneous Personal Services, Union
- Miscellaneous Photographers, Union
- Miscellaneous Professional, Union
- Modeling & Talent Agencies, Union
- Molds, Union
- Moravian Churches, Union
- Mortgage Bankers & Correspondents, Union
- Mortgages & Loans, Union
- Mosques, Union
- Motion Picture & Television Production Services, Union
- Motion Picture Dists Exchanges & Representatives, Union
- Motion Picture Pre & Post Production Services, Union
- Motor Vehicle, Union
- Motor Vehicle Rental & Leasing, Union
- Motorcycle Parts, Accessories & Dealers, Union
- Moving & Storage Consultants, Union
- Moving & Storage Supplies & Equipment, Union
- Moving Companies, Union
- Moving Truck Rental , Union
- Muffler Shop & Exhaust Systems, Union
- Museums, Union
- Music, Union
- Music Entertainment, Union
- Music Lessons, Union
- Music Lessons - Instrumental, Union
- Musical Instrument Manufacturers, Union
- Musical Instruments Repair, Sales & Service, Union
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