- Machine Shop & Tool Repair Service, Devon
- Machinery, Supplies & Equipment - Construction & Contractor Related, Devon
- Mailing, Delivery & Courier Service, Devon
- Management Consultants & Services, Devon
- Manicurists & Pedicurists, Devon
- Manufacturing, Devon
- Manufacturing Products, Devon
- Masonry Materials & Supplies, Devon
- Massage Therapists & Professional, Devon
- Massage Therapy, Devon
- Membership Sports & Recreation Clubs, Devon
- Millwrights, Devon
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- Miscellaneous Industry, Devon
- Miscellaneous Personal Services, Devon
- Miscellaneous Professional, Devon
- Money Transfer Service, Devon
- Mortgage Bankers & Correspondents, Devon
- Mortgage Brokers, Devon
- Motor Vehicle, Devon
- Motor Vehicle Rental & Leasing, Devon
- Moving Truck Rental , Devon
- Museums, Devon
- Music, Devon
- Musical Recording Services, Devon
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