- Machine Shop, Waterloo
- Machine Shop & Tool Repair Service, Waterloo
- Machinery, Supplies & Equipment - Business Production Related, Waterloo
- Machinery, Supplies & Equipment - Business Supplies Related, Waterloo
- Machinery, Supplies & Equipment - Construction & Contractor Related, Waterloo
- Mammography Clinics, Waterloo - Breast Cancer Screening
- Management Consultants & Services, Waterloo
- Manicurists & Pedicurists, Waterloo
- Manufacturing, Waterloo
- Manufacturing Products, Waterloo
- Marriage & Family Counselors, Waterloo
- Martial Arts & Self Defense Schools, Waterloo
- Masonry Contractors, Waterloo - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Waterloo
- Massage Therapists & Professional, Waterloo
- Massage Therapy, Waterloo
- Meat Market, Wholesale & Products, Waterloo
- Medical & Health Service Organizations, Waterloo
- Medical Claims Processing & Assistance, Waterloo
- Medical Groups & Clinics, Waterloo - Medical & Health Centers
- Medical Supplies & Equipment, Waterloo
- Membership Sports & Recreation Clubs, Waterloo
- Mental Health Specialists, Waterloo - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Waterloo
- Metal Buildings, Waterloo - Kits, Homes, Steel Buildings, etc
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- Metal Repair Service & Blacksmith, Waterloo - Iron Works
- Methodist Church, Waterloo
- Mexican Restaurants, Waterloo
- Millwork Contractors, Waterloo
- Miscellaneous Business Product Repair, Waterloo
- Miscellaneous Government, Waterloo
- Miscellaneous Industry, Waterloo
- Miscellaneous Personal Services, Waterloo
- Miscellaneous Photographers, Waterloo
- Miscellaneous Professional, Waterloo
- Monuments, Tombstones, Markers & Memorials, Waterloo
- Mortgage Bankers & Correspondents, Waterloo
- Mortgages & Loans, Waterloo
- Mosquito Control, Waterloo
- Motor Vehicle, Waterloo
- Motor Vehicle Rental & Leasing, Waterloo
- Movie Theaters, Waterloo
- Moving Companies, Waterloo
- Moving Truck Rental , Waterloo
- Muffler Shop & Exhaust Systems, Waterloo
- Music, Waterloo
- Music Entertainment, Waterloo
- Musical Instruments & Equipment Stores, Waterloo
- Musicians, Bands & Disc Jockeys, Waterloo
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