- Machine Shop & Tool Repair Service, Jena
- Machinery, Supplies & Equipment - Business Production Related, Jena
- Machinery, Supplies & Equipment - Business Supplies Related, Jena
- Machinery, Supplies & Equipment - Construction & Contractor Related, Jena
- Major Appliances, Jena - Household & Kitchen
- Management Consultants & Services, Jena
- Manicurists & Pedicurists, Jena
- Manufacturing, Jena
- Masonry Materials & Supplies, Jena
- Medical Supplies & Equipment, Jena
- Membership Sports & Recreation Clubs, Jena
- Metal Repair Service & Blacksmith, Jena - Iron Works
- Methodist Church, Jena
- Mexican Restaurants, Jena
- Mini & Self Storage, Jena
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- Mining, Jena
- Miscellaneous Business Services, Jena
- Miscellaneous Government, Jena
- Miscellaneous Personal Services, Jena
- Miscellaneous Photographers, Jena
- Mobile Home Parks & Communities , Jena
- Mortgage Bankers & Correspondents, Jena
- Motor Vehicle, Jena
- Motor Vehicle Rental & Leasing, Jena
- Moving Companies, Jena
- Moving Services - Labor & Material, Jena
- Moving Supplies & Equipment Rental, Jena
- Moving Truck Rental , Jena
- Museums, Jena
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