- Machine Shop & Tool Repair Service, Portage
- Machinery, Supplies & Equipment - Business Production Related, Portage
- Machinery, Supplies & Equipment - Business Supplies Related, Portage
- Machinery, Supplies & Equipment - Construction & Contractor Related, Portage
- Mail Delivery Service, Portage
- Mailbox Rental Services, Portage
- Mailing, Delivery & Courier Service, Portage
- Major Appliances, Portage - Household & Kitchen
- Malpractice Attorneys & Lawyers, Portage
- Malpractice Attorneys & Lawyers, Portage
- Malpractice Lawyers & Attorneys, Portage
- Management Consultants & Services, Portage
- Manicurists & Pedicurists, Portage
- Manufacturing, Portage
- Manufacturing Products, Portage
- Marinas & Marina Services, Portage
- Marriage & Family Counselors, Portage
- Martial Arts & Self Defense Schools, Portage
- Masonry Contractors, Portage - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Portage
- Masonry Panels Prefabricated, Portage
- Massage Therapists & Professional, Portage
- Massage Therapy, Portage
- Meat Market, Wholesale & Products, Portage
- Mechanical Contractors, Portage - Install, Service & Repair
- Mechanical Engineer, Portage - Mechanical Engineering Service
- Medical Diagnostic Equipment Mobile, Portage
- Medical Supplies & Equipment, Portage
- Membership Sports & Recreation Clubs, Portage
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- Mental Health Specialists, Portage - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Portage
- Metal Coating & Allied Services, Portage
- Metal Finishers, Portage
- Metal Plating & Polishing, Portage
- Methodist Church, Portage
- Mexican Restaurants, Portage
- Midwives, Portage
- Mini & Self Storage, Portage
- Mining, Portage
- Ministries Church, Portage
- Miscellaneous Business Services, Portage
- Miscellaneous Government, Portage
- Miscellaneous Industry, Portage
- Miscellaneous Manufacturing, Portage
- Miscellaneous Personal Services, Portage
- Miscellaneous Professional, Portage
- Mobile Home Parks & Communities , Portage
- Modular & Mobile Homes For Sale, Portage - Manufactured Homes Sale & Service
- Moisture & Vapor Control, Portage
- Monuments, Tombstones, Markers & Memorials, Portage
- Mortgage Bankers & Correspondents, Portage
- Motor Vehicle, Portage
- Motor Vehicle Rental & Leasing, Portage
- Movie Theaters, Portage
- Moving & Storage Supplies & Equipment, Portage
- Moving Truck Rental , Portage
- Muffler Shop & Exhaust Systems, Portage
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