- Machine Shop & Tool Repair Service, Southington
- Machine Shop Rotary Surface Grinding, Southington - Tool Grinding & Sharpening
- Machinery And Equipment Manufacturers, Southington
- Machinery, Supplies & Equipment - Business Production Related, Southington
- Machinery, Supplies & Equipment - Business Supplies Related, Southington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Southington
- Mailbox Rental Services, Southington
- Mailing, Delivery & Courier Service, Southington
- Major Appliances, Southington - Household & Kitchen
- Management Consultants & Services, Southington
- Manicurists & Pedicurists, Southington
- Manufacturing, Southington
- Manufacturing & Industrial Consultants, Southington
- Manufacturing Products, Southington
- Marriage & Family Counselors, Southington
- Martial Arts & Self Defense Schools, Southington
- Masonry Contractors, Southington - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Southington
- Massage Therapists & Professional, Southington
- Massage Therapy, Southington
- Mastectomy Apparel, Forms, Prostheses & Supplies, Southington
- Material Handling & Heavy Machinery & Equipment, Southington
- Material Handling Consultants, Southington
- Mausoleum Builders, Southington
- Mechanical Contractors, Southington - Install, Service & Repair
- Medical Groups & Clinics, Southington - Medical & Health Centers
- Medical Supplies & Equipment, Southington
- Membership Sports & Recreation Clubs, Southington
- Mental Health Specialists, Southington - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Southington
- Metal Coating & Allied Services, Southington
- Metal Deburring, Southington
- Metal Distributors, Southington
- Metal Plating & Polishing, Southington
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- Metal Products, Southington
- Metal Products, Southington
- Metal Services, Southington
- Metal Spinning Manufacturers, Southington
- Metal Stampings Manufacturers, Southington
- Mexican Restaurants, Southington
- Middle Eastern Restaurants, Southington
- Millwork Contractors, Southington
- Mini & Self Storage, Southington
- Mirrors, Southington - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Government, Southington
- Miscellaneous Industry, Southington
- Miscellaneous Metal Work Manufacturers, Southington
- Miscellaneous Personal Services, Southington
- Miscellaneous Photographers, Southington
- Miscellaneous Professional, Southington
- Mobile Home Parks & Communities , Southington
- Mongolian Restaurants, Southington
- Monuments, Tombstones, Markers & Memorials, Southington
- Mortgage Bankers & Correspondents, Southington
- Mortgage Companies, Southington
- Motor Vehicle, Southington
- Motor Vehicle Rental & Leasing, Southington
- Movie Theaters, Southington
- Moving & Storage Supplies & Equipment, Southington
- Moving Companies, Southington
- Moving Services - Labor & Material, Southington
- Muffler Shop & Exhaust Systems, Southington
- Mulch, Peat & Moss Products, Southington
- Music, Southington
- Music Lessons, Southington
- Music Lessons - Instrumental, Southington
- Musical Instruments & Equipment Stores, Southington
- Musical Instruments - Guitars, Southington
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