- Machine Shop & Tool Repair Service, Youngsville
- Machinery, Supplies & Equipment - Business Production Related, Youngsville
- Machinery, Supplies & Equipment - Business Supplies Related, Youngsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Youngsville
- Management Consultants & Services, Youngsville
- Manicurists & Pedicurists, Youngsville
- Manufacturing, Youngsville
- Manufacturing Products, Youngsville
- Marriage & Family Counselors, Youngsville
- Martial Arts & Self Defense Schools, Youngsville
- Masonry Materials & Supplies, Youngsville
- Meat Market, Wholesale & Products, Youngsville
- Membership Sports & Recreation Clubs, Youngsville
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- Millwork Contractors, Youngsville
- Miscellaneous Government, Youngsville
- Miscellaneous Manufacturing, Youngsville
- Miscellaneous Personal Services, Youngsville
- Miscellaneous Professional, Youngsville
- Modular & Mobile Homes For Sale, Youngsville - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Youngsville
- Motor Vehicle, Youngsville
- Motor Vehicle Rental & Leasing, Youngsville
- Motorcycle Parts, Accessories & Dealers, Youngsville
- Moving Companies, Youngsville
- Moving Truck Rental , Youngsville
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