- Machine Shop, Oswego
- Machine Shop & Tool Repair Service, Oswego
- Machine Tool Repair & Rebuild, Oswego
- Machinery And Equipment Manufacturers, Oswego
- Machinery Movers & Erectors, Oswego
- Machinery Repair & Rebuild, Oswego
- Machinery, Supplies & Equipment - Business Production Related, Oswego
- Machinery, Supplies & Equipment - Business Supplies Related, Oswego
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oswego
- Mailbox Rental Services, Oswego
- Mailing, Delivery & Courier Service, Oswego
- Management Consultants & Services, Oswego
- Manicurists & Pedicurists, Oswego
- Manufacturing, Oswego
- Manufacturing Products, Oswego
- Market Research & Analysis , Oswego - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Oswego
- Martial Arts & Self Defense Schools, Oswego
- Masonry Materials & Supplies, Oswego
- Massage Therapists & Professional, Oswego
- Massage Therapy, Oswego
- Material Handling Equipment, Oswego - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical & Dental Management, Oswego
- Medical Billing Services, Oswego
- Meeting & Event Planning Services, Oswego - Conference Consultants
- Membership Sports & Recreation Clubs, Oswego
- Men's Clothing Stores, Oswego - Clothes & Accessories
- Mental Health Specialists, Oswego - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Oswego
- Mexican Restaurants, Oswego
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- Millwrights, Oswego
- Mini & Self Storage, Oswego
- Ministries Church, Oswego
- Miscellaneous Business Product Repair, Oswego
- Miscellaneous Household Item Repair, Oswego
- Miscellaneous Agriculture, Oswego
- Miscellaneous Government, Oswego
- Miscellaneous Manufacturing, Oswego
- Miscellaneous Personal Services, Oswego
- Miscellaneous Photographers, Oswego
- Miscellaneous Professional, Oswego
- Monuments, Tombstones, Markers & Memorials, Oswego
- Mortgage Bankers & Correspondents, Oswego
- Mortgages & Loans, Oswego
- Motion Picture & Television Production Services, Oswego
- Motion Picture Dists & Producers, Oswego
- Motor Vehicle, Oswego
- Motor Vehicle Rental & Leasing, Oswego
- Motorcycle & Motor Scooters Dealers, Repair & Service, Oswego
- Motorcycle Parts, Accessories & Dealers, Oswego
- Motorcycle Repair & Service, Oswego
- Movie Theaters, Oswego
- Moving & Storage Supplies & Equipment, Oswego
- Moving Companies, Oswego
- Moving Supplies & Equipment Rental, Oswego
- Moving Truck Rental , Oswego
- Mulch, Peat & Moss Products, Oswego
- Music, Oswego
- Music Lessons, Oswego
- Music Lessons - Instrumental, Oswego
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