- Management Consultants & Services, Campbellville
- Manufacturers Agents & Representatives, Campbellville
- Manufacturers Representative, Campbellville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Campbellville
- Manufacturing Products, Campbellville
- Masonry Contractors, Campbellville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Campbellville
- Membership Sports & Recreation Clubs, Campbellville
- Metal Buildings, Campbellville - Kits, Homes, Steel Buildings, etc
- Mini & Self Storage, Campbellville
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- Miscellaneous Agriculture, Campbellville
- Miscellaneous Industry, Campbellville
- Miscellaneous Manufacturing, Campbellville
- Miscellaneous Professional, Campbellville
- Motor Vehicle, Campbellville
- Motor Vehicle Rental & Leasing, Campbellville
- Moving Companies, Campbellville
- Moving Supplies & Equipment Rental, Campbellville
- Moving Truck Rental , Campbellville
- Museums, Campbellville
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