- Machine Shop & Tool Repair Service, Derry
- Machine Tools , Derry
- Machinery Repair & Rebuild, Derry
- Machinery, Supplies & Equipment - Business Supplies Related, Derry
- Machinery, Supplies & Equipment - Construction & Contractor Related, Derry
- Management Consultants & Services, Derry
- Manicurists & Pedicurists, Derry
- Manufacturers Agents & Representatives, Derry
- Manufacturers Representative, Derry - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Derry
- Manufacturing Products, Derry
- Meat Market, Wholesale & Products, Derry
- Mechanical Contractors, Derry - Install, Service & Repair
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- Membership Sports & Recreation Clubs, Derry
- Methodist Church, Derry
- Mining, Derry
- Mining Contractors, Derry - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Derry - Mining Companies
- Miscellaneous Government, Derry
- Miscellaneous Manufacturing, Derry
- Miscellaneous Personal Services, Derry
- Miscellaneous Professional, Derry
- Motor Vehicle, Derry
- Motorcycle Parts, Accessories & Dealers, Derry
- Music, Derry
- Music Stores Retail, Derry
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