- Machine Shop, Rowley
- Machine Shop & Tool Repair Service, Rowley
- Machine Shops Experimental, Rowley
- Machinery, Supplies & Equipment - Business Production Related, Rowley
- Machinery, Supplies & Equipment - Business Supplies Related, Rowley
- Magnetic Devices, Rowley
- Magnets & Magnetic Devices, Rowley
- Mailbox Rental Services, Rowley
- Mailing, Delivery & Courier Service, Rowley
- Major Appliances, Rowley - Household & Kitchen
- Management Consultants & Services, Rowley
- Manicurists & Pedicurists, Rowley
- Manufacturers Agents & Representatives, Rowley
- Manufacturers Representative, Rowley - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Rowley
- Manufacturing Products, Rowley
- Marine Products And Services, Rowley
- Marine Repair & Service Stations, Rowley
- Marine Supplies & Equipment, Rowley - Boat Supplies
- Marine Supplies & Equipment Repair, Rowley - Boat Supplies & Equipment
- Marriage & Family Counselors, Rowley
- Masonry Contractors, Rowley - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Rowley
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- Mental Health Specialists, Rowley - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Rowley
- Metal Coating & Allied Services, Rowley
- Metal Heat Treating, Rowley
- Mexican Restaurants, Rowley
- Mini & Self Storage, Rowley
- Miscellaneous Household Item Repair, Rowley
- Miscellaneous Industry, Rowley
- Miscellaneous Manufacturing, Rowley
- Miscellaneous Personal Services, Rowley
- Miscellaneous Professional, Rowley
- Mortgage Bankers & Correspondents, Rowley
- Motor Vehicle, Rowley
- Motor Vehicle Rental & Leasing, Rowley
- Motorcycle & Motor Scooters Dealers, Repair & Service, Rowley
- Motorcycle Inspection Stations, Rowley
- Motorcycle Parts, Accessories & Dealers, Rowley
- Motorcycle Repair & Service, Rowley
- Moving & Storage Supplies & Equipment, Rowley
- Moving Companies, Rowley
- Moving Supplies & Equipment Rental, Rowley
- Moving Truck Rental , Rowley
- Muffler Shop & Exhaust Systems, Rowley
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