- Machine Shop, Louisville
- Machine Shop & Tool Repair Service, Louisville
- Machine Shop Rotary Surface Grinding, Louisville - Tool Grinding & Sharpening
- Machine Shops Slings, Louisville
- Machine Tools , Louisville
- Machine Tools Manufacturers Metal Cutting Types, Louisville
- Machinery And Equipment Manufacturers, Louisville
- Machinery Custom Design Manufacturers, Louisville
- Machinery Movers & Erectors, Louisville
- Machinery Repair & Rebuild, Louisville
- Machinery, Supplies & Equipment - Business Production Related, Louisville
- Machinery, Supplies & Equipment - Business Supplies Related, Louisville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Louisville
- Magazine & Newspaper Stands, Louisville - Dealers & Distributors
- Magicians & Hypnotist Entertainers, Louisville
- Magicians & Jugglers Equipment & Supplies, Louisville
- Magnetic Devices, Louisville
- Magnets & Magnetic Devices, Louisville
- Mailbox Rental Services, Louisville
- Mailboxes Retail, Louisville
- Mailing List Service, Brokers & Compilers, Louisville
- Mailing, Delivery & Courier Service, Louisville
- Maintenance, Cleaning & Sanitation, Louisville
- Major Appliance Parts, Louisville
- Major Appliance Repair & Service, Louisville
- Major Appliances, Louisville - Household & Kitchen
- Make Up & Cosmetics Application, Louisville
- Make Up Masquerade & Theatrical, Louisville
- Malls & Shopping Centers, Louisville
- Malpractice Attorneys & Lawyers, Louisville
- Malpractice Attorneys & Lawyers, Louisville
- Malpractice Lawyers & Attorneys, Louisville
- Management Consultants & Services, Louisville
- Management Training & Development, Louisville
- Manicurists & Pedicurists, Louisville
- Manifold Business Forms Manufacturers, Louisville
- Manufactured & Mobile Home Movers & Transporting, Louisville
- Manufacturers Agents & Representatives, Louisville
- Manufacturers Representative, Louisville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Louisville
- Manufacturing & Industrial Consultants, Louisville
- Manufacturing Equipment & Supplies, Louisville
- Manufacturing Products, Louisville
- Manufacturing Services, Louisville
- Map Publishers & Printers, Louisville
- Mapping & Topographical Services, Louisville
- Maps & Globes, Louisville
- Maps & Supplies, Louisville
- Marble, Louisville
- Marble & Terrazzo Flooring - Cleaning & Service, Louisville
- Marble Tile, Louisville
- Marinas & Marina Services, Louisville
- Marine Contractors & Designers, Louisville
- Marine Products And Services, Louisville
- Marine Repair & Service Stations, Louisville
- Marine Supplies & Equipment, Louisville - Boat Supplies
- Marine Supplies & Equipment Repair, Louisville - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Louisville
- Market Research & Analysis , Louisville - Market Analysis, Business & Economic Research
- Marketing Schools, Louisville
- Marriage & Family Counselors, Louisville
- Martial Arts & Self Defense Schools, Louisville
- Mary Kay Cosmetics, Louisville
- Masonry Contractors, Louisville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Louisville
- Mass Transit Vehicle Dealers, Louisville
- Massage Therapists & Professional, Louisville
- Massage Therapy, Louisville
- Massage Therapy Relaxation, Louisville
- Mastectomy Apparel, Forms, Prostheses & Supplies, Louisville
- Material Handling, Louisville
- Material Handling & Heavy Machinery & Equipment, Louisville
- Material Handling Equipment, Louisville - Conveyor Belt, Pallet Jack, Forklift, etc
- Maternity Clothes & Clothing Stores, Louisville - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Louisville
- Mattress & Bedspring Manufacturers, Louisville
- Mattresses Renovating, Louisville
- Mazda Dealers, Louisville
- Meat Market, Wholesale & Products, Louisville
- Meat Packers, Louisville
- Mechanical Contractors, Louisville - Install, Service & Repair
- Mechanical Engineer, Louisville - Mechanical Engineering Service
- Medical & Dental Assistant Schools, Louisville
- Medical & Dental Management, Louisville
- Medical & Health Service Organizations, Louisville
- Medical & Infectious Waste Disposal, Louisville
- Medical Alert Systems, Louisville - Medical Alarms - PERS
- Medical Attorneys & Lawyers, Louisville
- Medical Attorneys & Lawyers, Louisville
- Medical Billing Services, Louisville
- Medical Business Management Services, Louisville
- Medical Diagnostic Clinics, Louisville - Clinical Labs & Centers
- Medical Equipment Manufacturers, Louisville
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Louisville
- Medical Groups & Clinics, Louisville - Medical & Health Centers
- Medical Identification Jewelry, Louisville
- Medical Lawyers & Attorneys, Louisville
- Medical Management & Business Administration Service, Louisville
- Medical Records Service , Louisville
- Medical Research, Louisville
- Medical Research & Development, Louisville - Medical Information & Research
- Medical Supplies & Equipment, Louisville
- Mediterranean Restaurants, Louisville
- Meeting & Event Planning Services, Louisville - Conference Consultants
- Membership Sports & Recreation Clubs, Louisville
- Men's & Boys Clothing & Accessories Stores, Louisville
- Men's Clothing Stores, Louisville - Clothes & Accessories
- Men's Shoe Stores, Louisville
- Mens & Boys Hats, Gloves & Neckwear, Louisville
- Mens & Boys Jeans & Western Wear Stores, Louisville
- Mental Health Clinics, Louisville - Treatment Centers
- Mental Health Specialists, Louisville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Louisville
- Merchandising & Marketing Consultants, Louisville
- Merchandising & Pricing Equipment, Louisville
- Merle Norman Cosmetics, Louisville
- Messenger Service, Louisville - Message Receiving & Forwarding Service
- Messianic Synagogues, Louisville
- Metal Buildings, Louisville - Kits, Homes, Steel Buildings, etc
- Metal Distributors, Louisville
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- Metal Finishers, Louisville
- Metal Galvanizing, Louisville
- Metal Heat Treating, Louisville
- Metal Pigment & Paint Products, Louisville
- Metal Plating & Polishing, Louisville
- Metal Products, Louisville
- Metal Products, Louisville
- Metal Repair Service & Blacksmith, Louisville - Iron Works
- Metal Roll Forming Manufacturers, Louisville
- Metal Roofs, Louisville
- Metal Services, Louisville
- Metal Stampings Manufacturers, Louisville
- Metal Tanks, Louisville
- Metal Working Machinery, Louisville
- Metals, Louisville
- Metals Base, Louisville
- Metaphysical Churches, Louisville
- Metaphysicians, Louisville
- Methodist Church, Louisville
- Mexican & Latin American Goods & Products Stores, Louisville
- Mexican Food & Goods Products, Louisville
- Mexican Restaurants, Louisville
- Microfilm & Imaging Service, Equipment & Supplies , Louisville
- Middle Eastern Restaurants, Louisville
- Mildew Removal & Control, Louisville - Mold Removal
- Military Supplies, Louisville
- Mill Supplies & Equipment, Louisville - Milling Machines
- Millwork Contractors, Louisville
- Millwork Manufacturers, Louisville
- Mind-Body Massage, Louisville
- Minerals, Louisville
- Mini & Self Storage, Louisville
- Mini Golf Courses, Louisville
- Mining, Louisville
- Mining Contractors, Louisville - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, Louisville
- Mining, Crude-Oil Production, Louisville - Mining Companies
- Ministries Church, Louisville
- Mirrors, Louisville - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Louisville
- Miscellaneous Fabricated Wire Products Manufacturers, Louisville
- Miscellaneous Household Item Repair, Louisville
- Miscellaneous Prosthesis & Appliances, Louisville
- Miscellaneous Agriculture, Louisville
- Miscellaneous Business Services, Louisville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Louisville
- Miscellaneous Government, Louisville
- Miscellaneous Industry, Louisville
- Miscellaneous Manufacturing, Louisville
- Miscellaneous Metal Work Manufacturers, Louisville
- Miscellaneous Personal Services, Louisville
- Miscellaneous Photographers, Louisville
- Miscellaneous Professional, Louisville
- Missile & Rocket Components Manufacturers, Louisville
- Missing Persons Organizations, Louisville
- Mission Churches, Louisville
- Mobile Automobile Services, Louisville
- Mobile Home Contractors, Louisville
- Mobile Home Improvements & Repairs, Louisville
- Mobile Home Insurance, Louisville
- Mobile Home Parks & Communities , Louisville
- Modeling & Talent Agencies, Louisville
- Modular & Mobile Homes For Sale, Louisville - Manufactured Homes Sale & Service
- Moldings Materials, Louisville
- Molds, Louisville
- Money Counting & Wrapping, Louisville
- Mongolian Restaurants, Louisville
- Monuments, Tombstones, Markers & Memorials, Louisville
- Mortgage Bankers & Correspondents, Louisville
- Mortgage Brokers, Louisville
- Mortgage Companies, Louisville
- Mortgage Feasibility Consultants, Louisville
- Mortgages & Loans, Louisville
- Mosquito Control, Louisville
- Motion Picture & Television Production Services, Louisville
- Motion Picture Dists & Producers, Louisville
- Motion Picture Pre & Post Production Services, Louisville
- Motion Pictures Video Tape Duplication & Transfer Services, Louisville
- Motivational & Self Improvement Schools, Louisville
- Motivational Speakers & Consultants, Louisville - Speakers, Lectures & Seminars
- Motor Homes Renting & Leasing, Louisville
- Motor Vehicle, Louisville
- Motor Vehicle Rental & Leasing, Louisville
- Motorcycle & ATV Repair & Service, Louisville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Louisville
- Motorcycle Parts, Accessories & Dealers, Louisville
- Motorcycle Repair & Service, Louisville
- Motorcycles Paint & Refinishing, Louisville
- Mountain & Rock Climbing Equipment, Louisville
- Mountain & Rock Climbing Instruction, Louisville
- Movie Theaters, Louisville
- Moving & Storage Supplies & Equipment, Louisville
- Moving Companies, Louisville
- Moving Services - Labor & Material, Louisville
- Moving Supplies & Equipment Rental, Louisville
- Moving Truck Rental , Louisville
- Mowing Service, Louisville
- Muffler Shop & Exhaust Systems, Louisville
- Mulch, Peat & Moss Products, Louisville
- Multimedia Publishers, Louisville - Multimedia Services & Systems
- Murals & Faux Finish Walls, Louisville
- Museums, Louisville
- Music, Louisville
- Music Background Leased, Louisville
- Music Entertainment, Louisville
- Music Lessons, Louisville
- Music Lessons - Instrumental, Louisville
- Music Lessons - Vocal, Louisville
- Music Libraries, Louisville
- Music Schools, Louisville
- Music Sheet, Louisville
- Music Stores Retail, Louisville
- Musical Instrument Rental, Louisville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Louisville
- Musical Instruments - Guitars, Louisville
- Musical Instruments - Violins, Louisville
- Musical Instruments Repair, Sales & Service, Louisville
- Musical Recording Services, Louisville
- Musicians, Bands & Disc Jockeys, Louisville
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