- Machine Shop, Quinlan
- Machine Shop & Tool Repair Service, Quinlan
- Machinery, Supplies & Equipment - Construction & Contractor Related, Quinlan
- Mail Delivery Service, Quinlan
- Major Appliances, Quinlan - Household & Kitchen
- Management Consultants & Services, Quinlan
- Manicurists & Pedicurists, Quinlan
- Manufacturers Agents & Representatives, Quinlan
- Manufacturers Representative, Quinlan - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Quinlan
- Manufacturing Products, Quinlan
- Marinas & Marina Services, Quinlan
- Masonry Contractors, Quinlan - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Quinlan
- Mechanical Contractors, Quinlan - Install, Service & Repair
- Men's & Boys Clothing & Accessories Stores, Quinlan
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- Mens & Boys Jeans & Western Wear Stores, Quinlan
- Merchandise Sales Events, Quinlan
- Metal Repair Service & Blacksmith, Quinlan - Iron Works
- Methodist Church, Quinlan
- Mexican Restaurants, Quinlan
- Mini & Self Storage, Quinlan
- Miscellaneous Government, Quinlan
- Miscellaneous Manufacturing, Quinlan
- Miscellaneous Personal Services, Quinlan
- Mobile Home Insurance, Quinlan
- Mobile Home Parks & Communities , Quinlan
- Motor Vehicle, Quinlan
- Motor Vehicle Rental & Leasing, Quinlan
- Moving Companies, Quinlan
- Moving Truck Rental , Quinlan
- Muffler Shop & Exhaust Systems, Quinlan
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