- Machinery, Supplies & Equipment - Business Production Related, Discovery Bay
- Machinery, Supplies & Equipment - Business Supplies Related, Discovery Bay
- Mailbox Rental Services, Discovery Bay
- Mailing, Delivery & Courier Service, Discovery Bay
- Management Consultants & Services, Discovery Bay
- Manicurists & Pedicurists, Discovery Bay
- Manufacturing, Discovery Bay
- Marinas & Marina Services, Discovery Bay
- Marine Pilot & Operator Service, Discovery Bay
- Marine Supplies & Equipment, Discovery Bay - Boat Supplies
- Masonry Contractors, Discovery Bay - Stone Mason, Brick Mason - Install & Repair
- Membership Sports & Recreation Clubs, Discovery Bay
- Mexican Restaurants, Discovery Bay
- Mini & Self Storage, Discovery Bay
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- Miscellaneous Business Product Repair, Discovery Bay
- Miscellaneous Agriculture, Discovery Bay
- Miscellaneous Business Services, Discovery Bay
- Miscellaneous Government, Discovery Bay
- Monuments, Tombstones, Markers & Memorials, Discovery Bay
- Mortgage Bankers & Correspondents, Discovery Bay
- Mortgage Companies, Discovery Bay
- Mortgages & Loans, Discovery Bay
- Motor Vehicle, Discovery Bay
- Motor Vehicle Rental & Leasing, Discovery Bay
- Moving & Storage Supplies & Equipment, Discovery Bay
- Moving Companies, Discovery Bay
- Moving Services - Labor & Material, Discovery Bay
- Moving Truck Rental , Discovery Bay
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