- Machine Shop & Tool Repair Service, Middleton
- Machine Tools , Middleton
- Machinery And Equipment Manufacturers, Middleton
- Machinery, Supplies & Equipment - Business Production Related, Middleton
- Machinery, Supplies & Equipment - Business Supplies Related, Middleton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Middleton
- Magazine & Newspaper Stands, Middleton - Dealers & Distributors
- Mail Delivery Service, Middleton
- Mailbox Rental Services, Middleton
- Mailing, Delivery & Courier Service, Middleton
- Malls & Shopping Centers, Middleton
- Management Consultants & Services, Middleton
- Manicurists & Pedicurists, Middleton
- Manufacturers Agents & Representatives, Middleton
- Manufacturers Representative, Middleton - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Middleton
- Manufacturing & Industrial Consultants, Middleton
- Marriage & Family Counselors, Middleton
- Martial Arts & Self Defense Schools, Middleton
- Masonry Contractors, Middleton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Middleton
- Massage Therapists & Professional, Middleton
- Massage Therapy, Middleton
- Massage Therapy Relaxation, Middleton
- Meat Market, Wholesale & Products, Middleton
- Mechanical Contractors, Middleton - Install, Service & Repair
- Medical & Health Service Organizations, Middleton
- Medical Alert Systems, Middleton - Medical Alarms - PERS
- Medical Diagnostic Clinics, Middleton - Clinical Labs & Centers
- Medical Groups & Clinics, Middleton - Medical & Health Centers
- Medical Research, Middleton
- Medical Research & Development, Middleton - Medical Information & Research
- Medical Supplies & Equipment, Middleton
- Membership Sports & Recreation Clubs, Middleton
- Men's Clothing Stores, Middleton - Clothes & Accessories
- Mental Health Clinics, Middleton - Treatment Centers
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- Mental Health Specialists, Middleton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Middleton - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Middleton - Iron Works
- Mexican Restaurants, Middleton
- Middle Eastern Restaurants, Middleton
- Mind-Body Massage, Middleton
- Mini & Self Storage, Middleton
- Mirrors, Middleton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Middleton
- Miscellaneous Agriculture, Middleton
- Miscellaneous Business Services, Middleton
- Miscellaneous Government, Middleton
- Miscellaneous Industry, Middleton
- Miscellaneous Manufacturing, Middleton
- Miscellaneous Motor Vehicles, Middleton
- Miscellaneous Personal Services, Middleton
- Miscellaneous Photographers, Middleton
- Miscellaneous Professional, Middleton
- Mortgage Bankers & Correspondents, Middleton
- Mortgage Companies, Middleton
- Mortgages & Loans, Middleton
- Motion Picture Optical Research, Middleton
- Motion Picture Pre & Post Production Services, Middleton
- Motor Vehicle, Middleton
- Motorcycle & ATV Repair & Service, Middleton
- Motorcycle & Motor Scooters Dealers, Repair & Service, Middleton
- Motorcycle Parts, Accessories & Dealers, Middleton
- Motorcycle Repair & Service, Middleton
- Movie Theaters, Middleton
- Moving & Storage Supplies & Equipment, Middleton
- Muffler Shop & Exhaust Systems, Middleton
- Mulch, Peat & Moss Products, Middleton
- Museums, Middleton
- Music, Middleton
- Musical Instruments & Equipment Stores, Middleton
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