- Machine Shop & Tool Repair Service, Keansburg
- Major Appliances, Keansburg - Household & Kitchen
- Management Consultants & Services, Keansburg
- Manicurists & Pedicurists, Keansburg
- Marble & Terrazzo Flooring - Cleaning & Service, Keansburg
- Marinas & Marina Services, Keansburg
- Massage Therapists & Professional, Keansburg
- Massage Therapy, Keansburg
- Meat Market, Wholesale & Products, Keansburg
- Methodist Church, Keansburg
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- Mexican Restaurants, Keansburg
- Miscellaneous Household Item Repair, Keansburg
- Miscellaneous Government, Keansburg
- Miscellaneous Professional, Keansburg
- Mortgages & Loans, Keansburg
- Motor Vehicle, Keansburg
- Motorcycle & Motor Scooters Dealers, Repair & Service, Keansburg
- Motorcycle Parts, Accessories & Dealers, Keansburg
- Motorcycle Repair & Service, Keansburg
- Museums, Keansburg
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