- Machine Shop & Tool Repair Service, Ipswich
- Machine Shops Experimental, Ipswich
- Machinery, Supplies & Equipment - Business Supplies Related, Ipswich
- Mailing, Delivery & Courier Service, Ipswich
- Major Appliances, Ipswich - Household & Kitchen
- Management Consultants & Services, Ipswich
- Manicurists & Pedicurists, Ipswich
- Manufacturing, Ipswich
- Manufacturing Products, Ipswich
- Marble, Ipswich
- Marinas & Marina Services, Ipswich
- Marine Products And Services, Ipswich
- Marine Repair & Service Stations, Ipswich
- Marine Supplies & Equipment, Ipswich - Boat Supplies
- Marine Supplies & Equipment Repair, Ipswich - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Ipswich
- Marriage & Family Counselors, Ipswich
- Martial Arts & Self Defense Schools, Ipswich
- Masonry Contractors, Ipswich - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Ipswich
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- Massage Therapists & Professional, Ipswich
- Massage Therapy, Ipswich
- Meat Market, Wholesale & Products, Ipswich
- Mediterranean Restaurants, Ipswich
- Membership Sports & Recreation Clubs, Ipswich
- Mental Health Specialists, Ipswich - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Ipswich
- Metal Buildings, Ipswich - Kits, Homes, Steel Buildings, etc
- Metal Heat Treating, Ipswich
- Methodist Church, Ipswich
- Mexican Restaurants, Ipswich
- Mini & Self Storage, Ipswich
- Miscellaneous Household Item Repair, Ipswich
- Miscellaneous Personal Services, Ipswich
- Miscellaneous Professional, Ipswich
- Mortgage Bankers & Correspondents, Ipswich
- Motor Vehicle, Ipswich
- Museums, Ipswich
- Music, Ipswich
- Musical Recording Services, Ipswich
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