- Machine Shop & Tool Repair Service, Shirley
- Machine Tool Repair & Rebuild, Shirley
- Machinery, Supplies & Equipment - Business Production Related, Shirley
- Machinery, Supplies & Equipment - Business Supplies Related, Shirley
- Mail Delivery Service, Shirley
- Mailbox Rental Services, Shirley
- Mailing, Delivery & Courier Service, Shirley
- Major Appliances, Shirley - Household & Kitchen
- Management Consultants & Services, Shirley
- Manicurists & Pedicurists, Shirley
- Manufacturing, Shirley
- Manufacturing Products, Shirley
- Marble & Terrazzo Flooring - Cleaning & Service, Shirley
- Marble Contractors, Shirley - Installation, Cleaning & Removal Services
- Marine Contractors & Designers, Shirley
- Marriage & Family Counselors, Shirley
- Martial Arts & Self Defense Schools, Shirley
- Masonry Contractors, Shirley - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Shirley
- Meat Market, Wholesale & Products, Shirley
- Medical Diagnostic Clinics, Shirley - Clinical Labs & Centers
- Medical Groups & Clinics, Shirley - Medical & Health Centers
- Medical Supplies & Equipment, Shirley
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- Mental Health Clinics, Shirley - Treatment Centers
- Mexican Restaurants, Shirley
- Miscellaneous Household Item Repair, Shirley
- Miscellaneous Business Services, Shirley
- Miscellaneous Government, Shirley
- Miscellaneous Personal Services, Shirley
- Miscellaneous Professional, Shirley
- Modular & Mobile Homes For Sale, Shirley - Manufactured Homes Sale & Service
- Modular Buildings, Shirley - Modular Homes Buildings & Offices
- Monuments, Tombstones, Markers & Memorials, Shirley
- Mortgage Bankers & Correspondents, Shirley
- Motor Vehicle, Shirley
- Motor Vehicle Rental & Leasing, Shirley
- Moving & Storage Supplies & Equipment, Shirley
- Moving Companies, Shirley
- Moving Supplies & Equipment Rental, Shirley
- Moving Truck Rental , Shirley
- Music, Shirley
- Music Lessons, Shirley
- Music Lessons - Vocal, Shirley
- Musical Instruments & Equipment Stores, Shirley
- Musical Recording Services, Shirley
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