- Machinery And Equipment Manufacturers, Ellington
- Machinery, Supplies & Equipment - Business Production Related, Ellington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ellington
- Manufacturing, Ellington
- Marinas & Marina Services, Ellington
- Marine Lifts, Launching & Recovery, Ellington
- Marine Products And Services, Ellington
- Marine Services, Ellington
- Masonry Materials & Supplies, Ellington
- Medical Groups & Clinics, Ellington - Medical & Health Centers
- Methodist Church, Ellington
- Mexican Restaurants, Ellington
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- Mining, Ellington
- Mining Contractors, Ellington - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Ellington - Mining Companies
- Miscellaneous Agriculture, Ellington
- Miscellaneous Government, Ellington
- Miscellaneous Industry, Ellington
- Miscellaneous Personal Services, Ellington
- Motor Vehicle, Ellington
- Motor Vehicle Rental & Leasing, Ellington
- Moving Truck Rental , Ellington
- Museums, Ellington
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