- Mailing, Delivery & Courier Service, Clayton
- Maintenance, Cleaning & Sanitation, Clayton
- Manicurists & Pedicurists, Clayton
- Manufacturing, Clayton
- Manufacturing Products, Clayton
- Marinas & Marina Services, Clayton
- Marriage & Family Counselors, Clayton
- Masonry Materials & Supplies, Clayton
- Medical Supplies & Equipment, Clayton
- Methodist Church, Clayton
- Mexican Restaurants, Clayton
- Mini & Self Storage, Clayton
- Miscellaneous Household Item Repair, Clayton
- Miscellaneous Agriculture, Clayton
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- Miscellaneous Government, Clayton
- Miscellaneous Personal Services, Clayton
- Miscellaneous Professional, Clayton
- Modular & Mobile Homes For Sale, Clayton - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Clayton
- Motion Picture & Television Production Services, Clayton
- Motor Vehicle, Clayton
- Motorcycle & ATV Repair & Service, Clayton
- Motorcycle Repair & Service, Clayton
- Moving Companies, Clayton
- Mulch, Peat & Moss Products, Clayton
- Music, Clayton
- Musical Instruments & Equipment Stores, Clayton
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