- Machine Shop, Darby
- Machine Shop & Tool Repair Service, Darby
- Machinery, Supplies & Equipment - Business Production Related, Darby
- Machinery, Supplies & Equipment - Business Supplies Related, Darby
- Maintenance, Cleaning & Sanitation, Darby
- Major Appliances, Darby - Household & Kitchen
- Management Consultants & Services, Darby
- Manicurists & Pedicurists, Darby
- Manufacturers Agents & Representatives, Darby
- Manufacturers Representative, Darby - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Darby
- Marriage & Family Counselors, Darby
- Martial Arts & Self Defense Schools, Darby
- Masonry Contractors, Darby - Stone Mason, Brick Mason - Install & Repair
- Mechanical Contractors, Darby - Install, Service & Repair
- Medical & Dental Management, Darby
- Membership Sports & Recreation Clubs, Darby
- Men's Clothing Stores, Darby - Clothes & Accessories
- Mental Health Specialists, Darby - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, Darby - Message Receiving & Forwarding Service
- Metal Working Machinery, Darby
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- Metals Base, Darby
- Methodist Church, Darby
- Mildew Removal & Control, Darby - Mold Removal
- Mining, Darby
- Ministries Church, Darby
- Miscellaneous Household Item Repair, Darby
- Miscellaneous Government, Darby
- Miscellaneous Manufacturing, Darby
- Miscellaneous Personal Services, Darby
- Miscellaneous Professional, Darby
- Monuments, Tombstones, Markers & Memorials, Darby
- Mortgage Bankers & Correspondents, Darby
- Motor Vehicle, Darby
- Motor Vehicle Rental & Leasing, Darby
- Motorcycle Parts, Accessories & Dealers, Darby
- Moving & Storage Supplies & Equipment, Darby
- Moving Supplies & Equipment Rental, Darby
- Moving Truck Rental , Darby
- Muffler Shop & Exhaust Systems, Darby
- Music, Darby
- Musical Instruments & Equipment Stores, Darby
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