- Machine Shop, Altus
- Machine Shop & Tool Repair Service, Altus
- Machinery, Supplies & Equipment - Business Production Related, Altus
- Machinery, Supplies & Equipment - Business Supplies Related, Altus
- Machinery, Supplies & Equipment - Construction & Contractor Related, Altus
- Mail Boxes Manufacturers, Altus
- Mailboxes Retail, Altus
- Major Appliances, Altus - Household & Kitchen
- Malls & Shopping Centers, Altus
- Management Consultants & Services, Altus
- Manicurists & Pedicurists, Altus
- Manifold Business Forms Manufacturers, Altus
- Manufacturing, Altus
- Manufacturing Products, Altus
- Marriage & Family Counselors, Altus
- Masonry Contractors, Altus - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Altus
- Massage Therapists & Professional, Altus
- Massage Therapy, Altus
- Maytag Appliances, Altus
- Meat Market, Wholesale & Products, Altus
- Mechanical Contractors, Altus - Install, Service & Repair
- Medical Supplies & Equipment, Altus
- Men's & Boys Clothing & Accessories Stores, Altus
- Mens & Boys Jeans & Western Wear Stores, Altus
- Merchandise Sales Events, Altus
- Messianic Church, Altus
- Metal Boxes & Containers, Altus
- Metal Buildings, Altus - Wood Buildings
- Metal Buildings, Altus - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Altus - Iron Works
- Methodist Church, Altus
- Mexican Food, Altus
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- Mexican Restaurants, Altus
- Microwave Ovens, Altus
- Military And Veteran Attorneys & Lawyers, Altus
- Military And Veteran Attorneys & Lawyers, Altus
- Military And Veteran Lawyers & Attorneys, Altus
- Mini & Self Storage, Altus
- Mining, Altus
- Mirrors, Altus - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Altus
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Altus
- Miscellaneous Government, Altus
- Miscellaneous Personal Services, Altus
- Miscellaneous Photographers, Altus
- Miscellaneous Professional, Altus
- Monuments, Tombstones, Markers & Memorials, Altus
- Mortgage Bankers & Correspondents, Altus
- Mortgage Companies, Altus
- Mortgage Contracts & Services, Altus
- Mortgages & Loans, Altus
- Motor Vehicle, Altus
- Motor Vehicle Rental & Leasing, Altus
- Motorcycle & Motor Scooters Dealers, Repair & Service, Altus
- Motorcycle Parts, Accessories & Dealers, Altus
- Motorcycle Repair & Service, Altus
- Movie Theaters, Altus
- Moving Companies, Altus
- Moving Supplies & Equipment Rental, Altus
- Moving Truck Rental , Altus
- Muffler Shop & Exhaust Systems, Altus
- Museums, Altus
- Music, Altus
- Musical Instruments & Equipment Stores, Altus
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