- Machine Shop, Oswego
- Machine Shop & Tool Repair Service, Oswego
- Machinery, Supplies & Equipment - Business Production Related, Oswego
- Machinery, Supplies & Equipment - Business Supplies Related, Oswego
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oswego
- Mailing, Delivery & Courier Service, Oswego
- Major Appliances, Oswego - Household & Kitchen
- Malls & Shopping Centers, Oswego
- Management Consultants & Services, Oswego
- Manicurists & Pedicurists, Oswego
- Manufacturing, Oswego
- Manufacturing Products, Oswego
- Marinas & Marina Services, Oswego
- Marine Products And Services, Oswego
- Marine Repair & Service Stations, Oswego
- Marine Supplies & Equipment Repair, Oswego - Boat Supplies & Equipment
- Marriage & Family Counselors, Oswego
- Martial Arts & Self Defense Schools, Oswego
- Masonry Materials & Supplies, Oswego
- Massage Therapists & Professional, Oswego
- Massage Therapy, Oswego
- Meat Market, Wholesale & Products, Oswego
- Mechanical Contractors, Oswego - Install, Service & Repair
- Mechanical Engineer, Oswego - Mechanical Engineering Service
- Medical & Dental Management, Oswego
- Medical Groups & Clinics, Oswego - Medical & Health Centers
- Medical Supplies & Equipment, Oswego
- Meeting & Event Planning Services, Oswego - Conference Consultants
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- Membership Sports & Recreation Clubs, Oswego
- Mental Health Specialists, Oswego - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Oswego
- Mexican Restaurants, Oswego
- Miscellaneous Business Services, Oswego
- Miscellaneous Government, Oswego
- Miscellaneous Industry, Oswego
- Miscellaneous Personal Services, Oswego
- Miscellaneous Photographers, Oswego
- Miscellaneous Professional, Oswego
- Mobile Home Insurance, Oswego
- Mobile Home Parks & Communities , Oswego
- Mobile Lube Systems, Oswego
- Monuments, Tombstones, Markers & Memorials, Oswego
- Mortgage Bankers & Correspondents, Oswego
- Mortgage Service Bureaus, Oswego
- Motor Vehicle, Oswego
- Motor Vehicle Rental & Leasing, Oswego
- Movie Theaters, Oswego
- Moving Companies, Oswego
- Moving Supplies & Equipment Rental, Oswego
- Moving Truck Rental , Oswego
- Muffler Shop & Exhaust Systems, Oswego
- Museums, Oswego
- Music, Oswego
- Musical Instrument Rental, Oswego - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Oswego
- Musical Instruments Repair, Sales & Service, Oswego
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