- 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
- Mail Delivery Service, Loveland
- Mailbox Rental Services, Loveland
- Mailing, Delivery & Courier Service, Loveland
- Management Consultants & Services, Loveland
- Manicurists & Pedicurists, Loveland
- Manifold Business Forms Manufacturers, Loveland
- Manufacturers Agents & Representatives, Loveland
- Manufacturers Representative, Loveland - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Loveland
- Manufacturing Products, Loveland
- Manufacturing Services, Loveland
- Marriage & Family Counselors, 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
- Meat Market, Wholesale & Products, Loveland
- Mechanical Engineer, Loveland - Mechanical Engineering Service
- Mechanical Seals, Loveland
- Medical & Dental Assistant Schools, Loveland
- Membership Sports & Recreation Clubs, Loveland
- Mental Health Specialists, Loveland - Psychologist, Psychiatrist, Psychotherapist, etc
- Messianic Synagogues, Loveland
- Metal Tanks, Loveland
- Methodist Church, Loveland
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- Mexican Restaurants, Loveland
- Millwork Manufacturers, Loveland
- Mini & Self Storage, Loveland
- Mining, Loveland
- Miscellaneous Business Product Repair, Loveland
- Miscellaneous Household Item Repair, Loveland
- Miscellaneous Business Services, Loveland
- Miscellaneous Government, Loveland
- Miscellaneous Manufacturing, Loveland
- Miscellaneous Personal Services, Loveland
- Miscellaneous Photographers, Loveland
- Miscellaneous Professional, Loveland
- Mobile Home Parks & Communities , Loveland
- Modular & Mobile Homes For Sale, Loveland - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Loveland
- Mortgage Bankers & Correspondents, Loveland
- Mortgages & Loans, Loveland
- Motion Picture & Television Production Services, Loveland
- Motion Picture Dists & Producers, Loveland
- Motion Picture Pre & Post Production Services, Loveland
- Motor Vehicle, Loveland
- Motor Vehicle Rental & Leasing, Loveland
- Moving & Storage Supplies & Equipment, Loveland
- Moving Companies, Loveland
- Moving Supplies & Equipment Rental, Loveland
- Moving Truck Rental , Loveland
- Muffler Shop & Exhaust Systems, Loveland
- Museums, Loveland
- Music, Loveland
- Musical Instrument Rental, Loveland - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Loveland
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