- Machine Shop & Tool Repair Service, Johnston
- Machinery, Supplies & Equipment - Business Supplies Related, Johnston
- Machinery, Supplies & Equipment - Construction & Contractor Related, Johnston
- Mailbox Rental Services, Johnston
- Mailing, Delivery & Courier Service, Johnston
- Major Appliances, Johnston - Household & Kitchen
- Malls & Shopping Centers, Johnston
- Management Consultants & Services, Johnston
- Manicurists & Pedicurists, Johnston
- Manufacturers Agents & Representatives, Johnston
- Manufacturers Representative, Johnston - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Johnston
- Manufacturing Products, Johnston
- Marine Supplies & Equipment, Johnston - Boat Supplies
- Marriage & Family Counselors, Johnston
- Mary Kay Cosmetics, Johnston
- Masonry Contractors, Johnston - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Johnston
- Massage Therapists & Professional, Johnston
- Massage Therapy, Johnston
- Mechanical Contractors, Johnston - Install, Service & Repair
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- Membership Sports & Recreation Clubs, Johnston
- Metal Buildings, Johnston - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Johnston - Iron Works
- Mexican Restaurants, Johnston
- Miscellaneous Household Item Repair, Johnston
- Miscellaneous Agriculture, Johnston
- Miscellaneous Business Services, Johnston
- Miscellaneous Government, Johnston
- Miscellaneous Manufacturing, Johnston
- Miscellaneous Personal Services, Johnston
- Miscellaneous Photographers, Johnston
- Miscellaneous Professional, Johnston
- Mortgage Bankers & Correspondents, Johnston
- Mortgage Contracts & Services, Johnston
- Mortgages & Loans, Johnston
- Motion Picture & Television Production Services, Johnston
- Motivational & Self Improvement Schools, Johnston
- Motor Vehicle, Johnston
- Movie Theaters, Johnston
- Moving & Storage Supplies & Equipment, Johnston
- Musical Instruments Repair, Sales & Service, Johnston
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