- Machinery, Supplies & Equipment - Business Supplies Related, Byron
- Machinery, Supplies & Equipment - Construction & Contractor Related, Byron
- Mail Delivery Service, Byron
- Management Consultants & Services, Byron
- Manufacturing, Byron
- Masonry Materials & Supplies, Byron
- Mechanical Contractors, Byron - Install, Service & Repair
- Medical & Dental Management, Byron
- Medical Management & Business Administration Service, Byron
- Membership Sports & Recreation Clubs, Byron
- Men's & Boys Clothing & Accessories Stores, Byron
- Mens & Boys Jeans & Western Wear Stores, Byron
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- Mexican Restaurants, Byron
- Milk Bars, Byron
- Mining, Byron
- Miscellaneous Industry, Byron
- Miscellaneous Professional, Byron
- Monuments, Tombstones, Markers & Memorials, Byron
- Mortgage Bankers & Correspondents, Byron
- Motor Vehicle, Byron
- Motorcycle & ATV Repair & Service, Byron
- Motorcycle & Motor Scooters Dealers, Repair & Service, Byron
- Motorcycle Repair & Service, Byron
- Museums, Byron
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