- Machine Shop & Tool Repair Service, Byron
- Machinery, Supplies & Equipment - Construction & Contractor Related, Byron
- Mail Delivery Service, Byron
- Manufacturing, Byron
- Masonry Materials & Supplies, Byron
- Medical Supplies & Equipment, Byron
- Membership Sports & Recreation Clubs, Byron
- Methodist Church, Byron
- Mexican Restaurants, Byron
- Mini & Self Storage, Byron
- Miscellaneous Agriculture, Byron
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- Miscellaneous Government, Byron
- Miscellaneous Personal Services, Byron
- Mortgage Bankers & Correspondents, Byron
- Mortgage Contracts & Services, Byron
- Motion Picture Pre & Post Production Services, Byron
- Motor Vehicle, Byron
- Motor Vehicle Rental & Leasing, Byron
- Motorcycle Parts, Accessories & Dealers, Byron
- Moving Truck Rental , Byron
- Music, Byron
- Musical Instruments Repair, Sales & Service, Byron
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