- Machine Shop, Seymour
- Machine Shop & Tool Repair Service, Seymour
- Machinery And Equipment Manufacturers, Seymour
- Machinery, Supplies & Equipment - Business Production Related, Seymour
- Machinery, Supplies & Equipment - Business Supplies Related, Seymour
- Machinery, Supplies & Equipment - Construction & Contractor Related, Seymour
- Mailbox Rental Services, Seymour
- Mailing, Delivery & Courier Service, Seymour
- Management Consultants & Services, Seymour
- Manicurists & Pedicurists, Seymour
- Manufacturing, Seymour
- Manufacturing Products, Seymour
- Marble, Seymour
- Marriage & Family Counselors, Seymour
- Martial Arts & Self Defense Schools, Seymour
- Masonry Contractors, Seymour - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Seymour
- Meat Market, Wholesale & Products, Seymour
- Medical Supplies & Equipment, Seymour
- Membership Sports & Recreation Clubs, Seymour
- Methodist Church, Seymour
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- Mexican Restaurants, Seymour
- Mini & Self Storage, Seymour
- Mining, Seymour
- Miscellaneous Business Manufacturing, Seymour
- Miscellaneous Manufacturing, Seymour
- Miscellaneous Personal Services, Seymour
- Miscellaneous Professional, Seymour
- Molds Manufacturers, Seymour
- Monuments, Tombstones, Markers & Memorials, Seymour
- Mortgage Bankers & Correspondents, Seymour
- Mortgages & Loans, Seymour
- Motor Vehicle, Seymour
- Movie Theaters, Seymour
- Moving & Storage Supplies & Equipment, Seymour
- Moving Companies, Seymour
- Music, Seymour
- Music Lessons, Seymour
- Music Lessons - Instrumental, Seymour
- Music Lessons - Vocal, Seymour
- Musical Instruments Repair, Sales & Service, Seymour
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