- Machine Shop, Janesville
- Machine Shop & Tool Repair Service, Janesville
- Machine Shop Rotary Surface Grinding, Janesville - Tool Grinding & Sharpening
- Machine Tools , Janesville
- Machinery And Equipment Manufacturers, Janesville
- Machinery Movers & Erectors, Janesville
- Machinery, Supplies & Equipment - Business Production Related, Janesville
- Machinery, Supplies & Equipment - Business Supplies Related, Janesville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Janesville
- Magicians & Jugglers Equipment & Supplies, Janesville
- Mailbox Rental Services, Janesville
- Mailing, Delivery & Courier Service, Janesville
- Major Appliances, Janesville - Household & Kitchen
- Malls & Shopping Centers, Janesville
- Management Consultants & Services, Janesville
- Manicurists & Pedicurists, Janesville
- Manufacturers Agents & Representatives, Janesville
- Manufacturers Representative, Janesville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Janesville
- Manufacturing Products, Janesville
- Marine Products And Services, Janesville
- Marine Repair & Service Stations, Janesville
- Marine Supplies & Equipment, Janesville - Boat Supplies
- Marine Supplies & Equipment Repair, Janesville - Boat Supplies & Equipment
- Market Research & Analysis , Janesville - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Janesville
- Martial Arts & Self Defense Schools, Janesville
- Mary Kay Cosmetics, Janesville
- Masonry Contractors, Janesville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Janesville
- Massage Therapists & Professional, Janesville
- Massage Therapy, Janesville
- Material Handling & Heavy Machinery & Equipment, Janesville
- Material Handling Equipment, Janesville - Conveyor Belt, Pallet Jack, Forklift, etc
- Mattress & Bedspring Manufacturers, Janesville
- Mausoleums Developers, Janesville
- Meat Market, Wholesale & Products, Janesville
- Mechanical Contractors, Janesville - Install, Service & Repair
- Medical Diagnostic Imaging, Janesville
- Medical Equipment Manufacturers, Janesville
- Medical Groups & Clinics, Janesville - Medical & Health Centers
- Medical Identification Jewelry, Janesville
- Medical Research, Janesville
- Medical Research & Development, Janesville - Medical Information & Research
- Medical Supplies & Equipment, Janesville
- Membership Sports & Recreation Clubs, Janesville
- Men's & Boys Clothing & Accessories Stores, Janesville
- Men's Clothing Stores, Janesville - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Janesville
- Mental Health Clinics, Janesville - Treatment Centers
- Mental Health Specialists, Janesville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Janesville
- Merle Norman Cosmetics, Janesville
- Metal Buildings, Janesville - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Janesville
- Metal Cutting Machines, Janesville
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- Metal Cutting Services, Janesville
- Metal Perforating & Punching, Janesville
- Metal Products, Janesville
- Metal Repair Service & Blacksmith, Janesville - Iron Works
- Metal Stampings Manufacturers, Janesville
- Metal Working Machinery, Janesville
- Methodist Church, Janesville
- Mexican Food, Janesville
- Mexican Restaurants, Janesville
- Military Supplies, Janesville
- Milk Bars, Janesville
- Milk Buyers, Janesville
- Mill Supplies & Equipment, Janesville - Milling Machines
- Mini & Self Storage, Janesville
- Mini Golf Courses, Janesville
- Mining, Janesville
- Mirrors, Janesville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Janesville
- Miscellaneous Prosthesis & Appliances, Janesville
- Miscellaneous Agriculture, Janesville
- Miscellaneous Government, Janesville
- Miscellaneous Industry, Janesville
- Miscellaneous Manufacturing, Janesville
- Miscellaneous Metal Work Manufacturers, Janesville
- Miscellaneous Personal Services, Janesville
- Miscellaneous Photographers, Janesville
- Miscellaneous Professional, Janesville
- Mobile Home Parks & Communities , Janesville
- Modular & Mobile Homes For Sale, Janesville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Janesville
- Mortgage Bankers & Correspondents, Janesville
- Mortgages & Loans, Janesville
- Mosquito Control, Janesville
- Motion Picture & Television Production Services, Janesville
- Motor Vehicle, Janesville
- Motor Vehicle Rental & Leasing, Janesville
- Motorcycle & ATV Repair & Service, Janesville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Janesville
- Motorcycle Parts, Accessories & Dealers, Janesville
- Motorcycle Repair & Service, Janesville
- Motorcycles Paint & Refinishing, Janesville
- Movie Theaters, Janesville
- Moving & Storage Supplies & Equipment, Janesville
- Moving Companies, Janesville
- Moving Supplies & Equipment Rental, Janesville
- Moving Truck Rental , Janesville
- Muffler & Exhaust Systems Wholesale, Janesville
- Muffler Shop & Exhaust Systems, Janesville
- Mufflers & Exhaust Systems Manufacturers, Janesville
- Mulch, Peat & Moss Products, Janesville
- Murals & Faux Finish Walls, Janesville
- Music, Janesville
- Music Live & Pre Recorded, Janesville
- Musical Instruments & Equipment Stores, Janesville
- Musical Instruments Repair, Sales & Service, Janesville
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