- Machine Shop, Loveland
- Machine Shop & Tool Repair Service, Loveland
- Machinery Movers & Erectors, Loveland
- Machinery, Supplies & Equipment - Business Production Related, Loveland
- Machinery, Supplies & Equipment - Business Supplies Related, Loveland
- Machinery, Supplies & Equipment - Construction & Contractor Related, Loveland
- Magazine Ads, Loveland - Periodical Advertising
- Mailbox Rental Services, Loveland
- Mailing List Service, Brokers & Compilers, Loveland
- Mailing, Delivery & Courier Service, Loveland
- Maintenance, Cleaning & Sanitation, Loveland
- Major Appliances, Loveland - Household & Kitchen
- Malls & Shopping Centers, Loveland
- Management Consultants & Services, Loveland
- Manicurists & Pedicurists, Loveland
- Manufacturing, Loveland
- Manufacturing Products, Loveland
- Marinas & Marina Services, Loveland
- Marine Supplies & Equipment, Loveland - Boat Supplies
- Marketing Schools, Loveland
- Marriage & Family Counselors, Loveland
- Marriage Officiant, Loveland
- Martial Arts & Self Defense Schools, Loveland
- Masonry Contractors, Loveland - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Loveland
- Massage Therapists & Professional, Loveland
- Massage Therapy, Loveland
- Mastectomy Apparel, Forms, Prostheses & Supplies, Loveland
- Maternity Clothes & Clothing Stores, Loveland - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Loveland
- Measuring Instruments, Loveland - Measuring Machines & Equipment
- Meat Market, Wholesale & Products, Loveland
- Mechanical Contractors, Loveland - Install, Service & Repair
- Mechanical Engineer, Loveland - Mechanical Engineering Service
- Medical Diagnostic Clinics, Loveland - Clinical Labs & Centers
- Medical Equipment Manufacturers, Loveland
- Medical Groups & Clinics, Loveland - Medical & Health Centers
- Medical Supplies & Equipment, Loveland
- Medical Transcription Service, Loveland
- Mediterranean Restaurants, Loveland
- Meeting & Event Planning Services, Loveland - Conference Consultants
- Membership Sports & Recreation Clubs, Loveland
- Men's & Boys Clothing & Accessories Stores, Loveland
- Men's Clothing Stores, Loveland - Clothes & Accessories
- Men's Shoe Stores, Loveland
- Mens & Boys Belts & Suspenders, Loveland
- Mens & Womens Clothing, Loveland
- Mental Health Specialists, Loveland - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Loveland
- Merchandising & Pricing Equipment, Loveland
- Merle Norman Cosmetics, Loveland
- Metal Products, Loveland
- Metal Repair Service & Blacksmith, Loveland - Iron Works
- Metal Tanks, Loveland
- Methodist Church, Loveland
- Mexican Food & Goods Products, Loveland
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- Mexican Restaurants, Loveland
- Midwives, Loveland
- Mildew Removal & Control, Loveland - Mold Removal
- Millwork Manufacturers, Loveland
- Mini & Self Storage, Loveland
- Mining, Loveland
- Miscellaneous Business Product Repair, Loveland
- Miscellaneous Household Item Repair, Loveland
- Miscellaneous Retail Stores, Loveland
- Miscellaneous Agriculture, Loveland
- Miscellaneous Business Services, Loveland
- Miscellaneous Government, Loveland
- Miscellaneous Manufacturing, Loveland
- Miscellaneous Personal Services, Loveland
- Miscellaneous Photographers, Loveland
- Miscellaneous Professional, Loveland
- Mission Churches, Loveland
- Mobile Automobile Services, Loveland
- Mobile Home Parks & Communities , Loveland
- Mobile Homes, Loveland
- Mobile Homes Manufactures, Loveland
- Modular & Mobile Homes For Sale, Loveland - Manufactured Homes Sale & Service
- Moldings Materials, Loveland
- Monuments, Tombstones, Markers & Memorials, Loveland
- Mopeds & Motor Scooters Rental, Loveland
- Mortgage Bankers & Correspondents, Loveland
- Mortgage Brokers, Loveland
- Mortgage Companies, Loveland
- Mortgage Contracts & Services, Loveland
- Mortgage Feasibility Consultants, Loveland
- Mortgages & Loans, Loveland
- Mosquito Control, Loveland
- Motion Pictures Video Tape Duplication & Transfer Services, Loveland
- Motivational & Self Improvement Schools, Loveland
- Motor Vehicle, Loveland
- Motor Vehicle Rental & Leasing, Loveland
- Motorcycle & ATV Repair & Service, Loveland
- Motorcycle & Motor Scooters Dealers, Repair & Service, Loveland
- Motorcycle Apparel, Loveland
- Motorcycle Parts, Accessories & Dealers, Loveland
- Motorcycle Repair & Service, Loveland
- Movie Theaters, Loveland
- Moving & Storage Supplies & Equipment, Loveland
- Moving Companies, Loveland
- Moving Supplies & Equipment Rental, Loveland
- Moving Truck Rental , Loveland
- Muffler Shop & Exhaust Systems, Loveland
- Multimedia Publishers, Loveland - Multimedia Services & Systems
- Museums, Loveland
- Music, Loveland
- Music Schools, Loveland
- Musical Instrument Rental, Loveland - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Loveland
- Musical Instruments Repair, Sales & Service, Loveland
- Musical Recording Services, Loveland
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