- Machine Shop, Martinez
- Machine Shop & Tool Repair Service, Martinez
- Machinery, Supplies & Equipment - Business Production Related, Martinez
- Machinery, Supplies & Equipment - Business Supplies Related, Martinez
- Machinery, Supplies & Equipment - Construction & Contractor Related, Martinez
- Magazine & Newspaper Stands, Martinez - Dealers & Distributors
- Magicians & Jugglers Equipment & Supplies, Martinez
- Mailbox Rental Services, Martinez
- Mailing List Service, Brokers & Compilers, Martinez
- Mailing, Delivery & Courier Service, Martinez
- Management Consultants & Services, Martinez
- Manicurists & Pedicurists, Martinez
- Manufacturers Agents & Representatives, Martinez
- Manufacturers Representative, Martinez - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Martinez
- Manufacturing Products, Martinez
- Marble, Martinez
- Marinas & Marina Services, Martinez
- Marine Pilot & Operator Service, Martinez
- Marriage & Family Counselors, Martinez
- Martial Arts & Self Defense Schools, Martinez
- Masonry Contractors, Martinez - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Martinez
- Massage Therapists & Professional, Martinez
- Massage Therapy, Martinez
- Maternity Clothes & Clothing Stores, Martinez - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Martinez
- Mechanical Engineer, Martinez - Mechanical Engineering Service
- Medical Billing Services, Martinez
- Medical Groups & Clinics, Martinez - Medical & Health Centers
- Medical Supplies & Equipment, Martinez
- Membership Sports & Recreation Clubs, Martinez
- Mental Health Specialists, Martinez - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Martinez - Iron Works
- Metallurgical Testing Labs, Martinez
- Methodist Church, Martinez
- Mexican Restaurants, Martinez
- Mini & Self Storage, Martinez
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- Mining, Martinez
- Miscellaneous Business Product Repair, Martinez
- Miscellaneous Household Item Repair, Martinez
- Miscellaneous Agriculture, Martinez
- Miscellaneous Business Services, Martinez
- Miscellaneous Government, Martinez
- Miscellaneous Manufacturing, Martinez
- Miscellaneous Personal Services, Martinez
- Miscellaneous Photographers, Martinez
- Miscellaneous Professional, Martinez
- Mobile Home Contractors, Martinez
- Mobile Home Improvements & Repairs, Martinez
- Mobile Homes Manufactures, Martinez
- Modular & Mobile Homes For Sale, Martinez - Manufactured Homes Sale & Service
- Moldings Materials, Martinez
- Mortgage Bankers & Correspondents, Martinez
- Mortgage Companies, Martinez
- Mortgages & Loans, Martinez
- Motion Picture Pre & Post Production Services, Martinez
- Motor Vehicle, Martinez
- Motor Vehicle Rental & Leasing, Martinez
- Motorcycle & Motor Scooters Dealers, Repair & Service, Martinez
- Motorcycle Parts, Accessories & Dealers, Martinez
- Motorcycle Repair & Service, Martinez
- Movie Theaters, Martinez
- Moving & Storage Supplies & Equipment, Martinez
- Moving Companies, Martinez
- Moving Services - Labor & Material, Martinez
- Moving Truck Rental , Martinez
- Muffler Shop & Exhaust Systems, Martinez
- Museums, Martinez
- Music, Martinez
- Music Entertainment, Martinez
- Music Lessons, Martinez
- Music Lessons - Instrumental, Martinez
- Musical Instruments & Equipment Stores, Martinez
- Musical Recording Services, Martinez
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