- Machine Shop & Tool Repair Service, Castaic
- Machinery, Supplies & Equipment - Business Production Related, Castaic
- Machinery, Supplies & Equipment - Business Supplies Related, Castaic
- Machinery, Supplies & Equipment - Construction & Contractor Related, Castaic
- Mailbox Rental Services, Castaic
- Mailing, Delivery & Courier Service, Castaic
- Management Consultants & Services, Castaic
- Manicurists & Pedicurists, Castaic
- Marine Supplies & Equipment, Castaic - Boat Supplies
- Masonry Contractors, Castaic - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Castaic
- Medical Billing Services, Castaic
- Membership Sports & Recreation Clubs, Castaic
- Mexican Restaurants, Castaic
- Mini & Self Storage, Castaic
- Mining, Castaic
- Miscellaneous Household Item Repair, Castaic
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- Miscellaneous Government, Castaic
- Miscellaneous Personal Services, Castaic
- Miscellaneous Professional, Castaic
- Mobile Home Parks & Communities , Castaic
- Modular & Mobile Homes For Sale, Castaic - Manufactured Homes Sale & Service
- Motor Vehicle, Castaic
- Motor Vehicle Rental & Leasing, Castaic
- Motorcycle Parts, Accessories & Dealers, Castaic
- Moving & Storage Supplies & Equipment, Castaic
- Moving Companies, Castaic
- Moving Truck Rental , Castaic
- Music, Castaic
- Music Lessons, Castaic
- Music Lessons - Instrumental, Castaic
- Music Production Services, Castaic
- Musical Instruments & Equipment Stores, Castaic
- Musical Recording Services, Castaic
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