- Machine Shop & Tool Repair Service, Romulus
- Machine Tools , Romulus
- Machinery And Equipment Manufacturers, Romulus
- Machinery, Supplies & Equipment - Business Production Related, Romulus
- Machinery, Supplies & Equipment - Business Supplies Related, Romulus
- Machinery, Supplies & Equipment - Construction & Contractor Related, Romulus
- Magazine & Newspaper Stands, Romulus - Dealers & Distributors
- Mailing, Delivery & Courier Service, Romulus
- Make Up & Cosmetics Application, Romulus
- Management Consultants & Services, Romulus
- Manufacturers Agents & Representatives, Romulus
- Manufacturers Representative, Romulus - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Romulus
- Manufacturing & Industrial Consultants, Romulus
- Manufacturing Products, Romulus
- Marble, Romulus
- Marble Tile, Romulus
- Marriage & Family Counselors, Romulus
- Martial Arts & Self Defense Schools, Romulus
- Masonry Materials & Supplies, Romulus
- Material Handling & Heavy Machinery & Equipment, Romulus
- Mats & Matting, Romulus
- Mattress & Bedspring Manufacturers, Romulus
- Meals Ready To Eat Manufacturers, Romulus
- Medical Billing Services, Romulus
- Medical Diagnostic Clinics, Romulus - Clinical Labs & Centers
- Medical Supplies & Equipment, Romulus
- Mediterranean Restaurants, Romulus
- Meeting & Event Planning Services, Romulus - Conference Consultants
- Membership Sports & Recreation Clubs, Romulus
- Mental Health Clinics, Romulus - Treatment Centers
- Mental Retardation & Developmentally Disabled Services, Romulus
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- Merchandise Sales Events, Romulus
- Messenger Service, Romulus - Message Receiving & Forwarding Service
- Metal Coating & Allied Services, Romulus
- Metal Cutting Services, Romulus
- Metal Pails, Drums & Barrel Manufacturers, Romulus
- Metal Plating & Polishing, Romulus
- Metal Powder Products, Romulus
- Metal Stampings Manufacturers, Romulus
- Methodist Church, Romulus
- Micro Computers, Romulus
- Mini & Self Storage, Romulus
- Miscellaneous Business Product Repair, Romulus
- Miscellaneous Household Item Repair, Romulus
- Miscellaneous Agriculture, Romulus
- Miscellaneous Government, Romulus
- Miscellaneous Industry, Romulus
- Miscellaneous Manufacturing, Romulus
- Miscellaneous Metal Work Manufacturers, Romulus
- Miscellaneous Personal Services, Romulus
- Miscellaneous Professional, Romulus
- Mission Churches, Romulus
- Mobile Home Parks & Communities , Romulus
- Modular & Mobile Homes For Sale, Romulus - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Romulus
- Motor Vehicle, Romulus
- Motor Vehicle Rental & Leasing, Romulus
- Moving Companies, Romulus
- Moving Supplies & Equipment Rental, Romulus
- Moving Truck Rental , Romulus
- Music, Romulus
- Music Production Services, Romulus
- Musical Recording Services, Romulus
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