- Machine Shop & Tool Repair Service, Brooks
- Machinery, Supplies & Equipment - Business Production Related, Brooks
- Mail Delivery Service, Brooks
- Major Appliances, Brooks - Household & Kitchen
- Management Consultants & Services, Brooks
- Manufacturing, Brooks
- Manufacturing Products, Brooks
- Masonry Contractors, Brooks - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Brooks
- Massage Therapy, Brooks
- Membership Sports & Recreation Clubs, Brooks
- Metal Pails, Drums & Barrel Manufacturers, Brooks
- Metal Repair Service & Blacksmith, Brooks - Iron Works
- Metallurgical Testing Labs, Brooks
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- Mini & Self Storage, Brooks
- Mining, Brooks
- Miscellaneous Business Services, Brooks
- Miscellaneous Government, Brooks
- Mobile Home Contractors, Brooks
- Mobile Home Improvements & Repairs, Brooks
- Motor Vehicle, Brooks
- Motor Vehicle Rental & Leasing, Brooks
- Motorcycle & Motor Scooters Dealers, Repair & Service, Brooks
- Motorcycle Parts, Accessories & Dealers, Brooks
- Motorcycle Repair & Service, Brooks
- Moving Truck Rental , Brooks
- Muffler Shop & Exhaust Systems, Brooks
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