- Machine Shop & Tool Repair Service, Center Valley
- Machine Tools , Center Valley
- Machinery, Supplies & Equipment - Business Supplies Related, Center Valley
- Mailboxes Retail, Center Valley
- Major Appliances, Center Valley - Household & Kitchen
- Malls & Shopping Centers, Center Valley
- Management Consultants & Services, Center Valley
- Manicurists & Pedicurists, Center Valley
- Manufacturing, Center Valley
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Center Valley
- Medical Supplies & Equipment, Center Valley
- Membership Sports & Recreation Clubs, Center Valley
- Men's Clothing Stores, Center Valley - Clothes & Accessories
- Merchandise Sales Events, Center Valley
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- Mini Golf Courses, Center Valley
- Miscellaneous Government, Center Valley
- Miscellaneous Manufacturing, Center Valley
- Miscellaneous Photographers, Center Valley
- Miscellaneous Professional, Center Valley
- Mortgage Bankers & Correspondents, Center Valley
- Mortgages & Loans, Center Valley
- Motor Sports, Center Valley
- Motor Vehicle, Center Valley
- Motor Vehicle Rental & Leasing, Center Valley
- Movie Theaters, Center Valley
- Moving Supplies & Equipment Rental, Center Valley
- Moving Truck Rental , Center Valley
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