- Machine Shop & Tool Repair Service, Hayward
- Machinery, Supplies & Equipment - Business Production Related, Hayward
- Machinery, Supplies & Equipment - Business Supplies Related, Hayward
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hayward
- Magazine & Newspaper Stands, Hayward - Dealers & Distributors
- Mailbox Rental Services, Hayward
- Mailing, Delivery & Courier Service, Hayward
- Major Appliances, Hayward - Household & Kitchen
- Malls & Shopping Centers, Hayward
- Management Consultants & Services, Hayward
- Manicurists & Pedicurists, Hayward
- Manufacturers Agents & Representatives, Hayward
- Manufacturers Representative, Hayward - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Hayward
- Manufacturing Products, Hayward
- Marinas & Marina Services, Hayward
- Marine Cargo Handling, Hayward
- Marine Products And Services, Hayward
- Marine Services, Hayward
- Marine Supplies & Equipment, Hayward - Boat Supplies
- Marriage & Family Counselors, Hayward
- Masonry Contractors, Hayward - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Hayward
- Massage Therapists & Professional, Hayward
- Massage Therapy, Hayward
- Meat Market, Wholesale & Products, Hayward
- Medical Supplies & Equipment, Hayward
- Membership Sports & Recreation Clubs, Hayward
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- Mental Health Specialists, Hayward - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Hayward - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Hayward - Iron Works
- Methodist Church, Hayward
- Mexican Restaurants, Hayward
- Mini & Self Storage, Hayward
- Mini Golf Courses, Hayward
- Miscellaneous Household Item Repair, Hayward
- Miscellaneous Retail Stores, Hayward
- Miscellaneous Business Services, Hayward
- Miscellaneous Government, Hayward
- Miscellaneous Industry, Hayward
- Miscellaneous Manufacturing, Hayward
- Miscellaneous Personal Services, Hayward
- Miscellaneous Photographers, Hayward
- Miscellaneous Professional, Hayward
- Modular & Mobile Homes For Sale, Hayward - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Hayward
- Motor Vehicle, Hayward
- Motor Vehicle Rental & Leasing, Hayward
- Motorcycle & Motor Scooters Dealers, Repair & Service, Hayward
- Motorcycle Repair & Service, Hayward
- Movie Theaters, Hayward
- Moving Supplies & Equipment Rental, Hayward
- Moving Truck Rental , Hayward
- Muffler Shop & Exhaust Systems, Hayward
- Mulch, Peat & Moss Products, Hayward
- Museums, Hayward
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