- Machine Shop & Tool Repair Service, Exeter
- Machinery, Supplies & Equipment - Business Production Related, Exeter
- Machinery, Supplies & Equipment - Business Supplies Related, Exeter
- Machinery, Supplies & Equipment - Construction & Contractor Related, Exeter
- Management Consultants & Services, Exeter
- Manufactured & Mobile Home Movers & Transporting, Exeter
- Manufacturing, Exeter
- Manufacturing Products, Exeter
- Masonry Materials & Supplies, Exeter
- Massage Therapists & Professional, Exeter
- Massage Therapy, Exeter
- Meat Market, Wholesale & Products, Exeter
- Medical Supplies & Equipment, Exeter
- Membership Sports & Recreation Clubs, Exeter
- Metal Products, Exeter
- Metal Repair Service & Blacksmith, Exeter - Iron Works
- Millwork Manufacturers, Exeter
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- Mini & Self Storage, Exeter
- Miscellaneous Government, Exeter
- Miscellaneous Industry, Exeter
- Miscellaneous Personal Services, Exeter
- Miscellaneous Professional, Exeter
- Mobile Homes, Exeter
- Mobile Homes Manufactures, Exeter
- Modular Buildings, Exeter - Modular Homes Buildings & Offices
- Monuments, Tombstones, Markers & Memorials, Exeter
- Mortgage Bankers & Correspondents, Exeter
- Motor Vehicle, Exeter
- Moving Companies, Exeter
- Music, Exeter
- Music Lessons, Exeter
- Music Lessons - Instrumental, Exeter
- Musical Instruments & Equipment Stores, Exeter
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