- Machinery, Supplies & Equipment - Business Production Related, San Ysidro
- Machinery, Supplies & Equipment - Business Supplies Related, San Ysidro
- Mailbox Rental Services, San Ysidro
- Mailing, Delivery & Courier Service, San Ysidro
- Malls & Shopping Centers, San Ysidro
- Management Consultants & Services, San Ysidro
- Manicurists & Pedicurists, San Ysidro
- Manufacturing, San Ysidro
- Marine Supplies & Equipment, San Ysidro - Boat Supplies
- Martial Arts & Self Defense Schools, San Ysidro
- Maternity Clothes & Clothing Stores, San Ysidro - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, San Ysidro
- Medical Groups & Clinics, San Ysidro - Medical & Health Centers
- Medical Supplies & Equipment, San Ysidro
- Men's Clothing Stores, San Ysidro - Clothes & Accessories
- Mens & Womens Clothing, San Ysidro
- Merchandise Sales Events, San Ysidro
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- Mexican Restaurants, San Ysidro
- Mini & Self Storage, San Ysidro
- Mining, San Ysidro
- Ministries Church, San Ysidro
- Miscellaneous Government, San Ysidro
- Mobile Home Parks & Communities , San Ysidro
- Money Brokers, San Ysidro
- Money Transfer Service, San Ysidro
- Mortgages & Loans, San Ysidro
- Motor Vehicle, San Ysidro
- Motor Vehicle Rental & Leasing, San Ysidro
- Moving Companies, San Ysidro
- Moving Supplies & Equipment Rental, San Ysidro
- Moving Truck Rental , San Ysidro
- Multimedia Publishers, San Ysidro - Multimedia Services & Systems
- Musical Instrument Rental, San Ysidro - Band & Orchestra Instruments
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