- Machine Shop & Tool Repair Service, Middlefield
- Machinery, Supplies & Equipment - Business Production Related, Middlefield
- Machinery, Supplies & Equipment - Business Supplies Related, Middlefield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Middlefield
- Mail Delivery Service, Middlefield
- Major Appliances, Middlefield - Household & Kitchen
- Management Consultants & Services, Middlefield
- Manufacturers Agents & Representatives, Middlefield
- Manufacturing, Middlefield
- Masonry Contractors, Middlefield - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Middlefield
- Massage Therapists & Professional, Middlefield
- Massage Therapy, Middlefield
- Meat Market, Wholesale & Products, Middlefield
- Medical Supplies & Equipment, Middlefield
- Mennonite Church, Middlefield
- Mental Health Clinics, Middlefield - Treatment Centers
- Mental Health Specialists, Middlefield - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Middlefield - Wood Buildings
- Metal Buildings, Middlefield - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Middlefield - Iron Works
- Metal Roofs, Middlefield
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- Methodist Church, Middlefield
- Mexican Restaurants, Middlefield
- Millwork Contractors, Middlefield
- Mini & Self Storage, Middlefield
- Mining, Middlefield
- Miscellaneous Agriculture, Middlefield
- Miscellaneous Government, Middlefield
- Miscellaneous Industry, Middlefield
- Miscellaneous Manufacturing, Middlefield
- Miscellaneous Professional, Middlefield
- Mortgage Bankers & Correspondents, Middlefield
- Mortgage Companies, Middlefield
- Mortgage Contracts & Services, Middlefield
- Mortgages & Loans, Middlefield
- Motor Vehicle, Middlefield
- Motor Vehicle Rental & Leasing, Middlefield
- Motorcycle Parts, Accessories & Dealers, Middlefield
- Moving Supplies & Equipment Rental, Middlefield
- Moving Truck Rental , Middlefield
- Muffler Shop & Exhaust Systems, Middlefield
- Mulch, Peat & Moss Products, Middlefield
- Musical Instruments Repair, Sales & Service, Middlefield
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