- Machinery Movers & Erectors, San Juan
- Machinery, Supplies & Equipment - Business Production Related, San Juan
- Machinery, Supplies & Equipment - Construction & Contractor Related, San Juan
- Management Consultants & Services, San Juan
- Manufactured & Mobile Home Movers & Transporting, San Juan
- Manufacturing, San Juan
- Masonry Materials & Supplies, San Juan
- Meat Market, Wholesale & Products, San Juan
- Medical Billing Services, San Juan
- Meeting & Event Planning Services, San Juan - Conference Consultants
- Merchandising & Pricing Equipment, San Juan
- Mexican Food, San Juan
- Mexican Restaurants, San Juan
- Mini & Self Storage, San Juan
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- Miscellaneous Government, San Juan
- Miscellaneous Personal Services, San Juan
- Miscellaneous Photographers, San Juan
- Miscellaneous Professional, San Juan
- Mobile Home Parks & Communities , San Juan
- Modular & Mobile Homes For Sale, San Juan - Manufactured Homes Sale & Service
- Motor Vehicle, San Juan
- Motor Vehicle Rental & Leasing, San Juan
- Muffler Shop & Exhaust Systems, San Juan
- Music, San Juan
- Music Lessons, San Juan
- Music Lessons - Instrumental, San Juan
- Musical Instruments & Equipment Stores, San Juan
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