- Machinery, Supplies & Equipment - Business Production Related, Castroville
- Maintenance, Cleaning & Sanitation, Castroville
- Major Appliances, Castroville - Household & Kitchen
- Management Consultants & Services, Castroville
- Manicurists & Pedicurists, Castroville
- Manufacturing, Castroville
- Meat Market, Wholesale & Products, Castroville
- Membership Sports & Recreation Clubs, Castroville
- Mexican Restaurants, Castroville
- Mildew Removal & Control, Castroville - Mold Removal
- Mini & Self Storage, Castroville
- Miscellaneous Business Services, Castroville
- Miscellaneous Government, Castroville
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- Miscellaneous Personal Services, Castroville
- Mobile Home Contractors, Castroville
- Mobile Home Improvements & Repairs, Castroville
- Mobile Home Parks & Communities , Castroville
- Mortgage Companies, Castroville
- Motor Vehicle, Castroville
- Motor Vehicle Rental & Leasing, Castroville
- Moving Companies, Castroville
- Moving Services - Labor & Material, Castroville
- Moving Supplies & Equipment Rental, Castroville
- Moving Truck Rental , Castroville
- Muffler Shop & Exhaust Systems, Castroville
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