- Machine Shop, Longmont
- Machine Shop & Tool Repair Service, Longmont
- Machine Tools , Longmont
- Machinery And Equipment Manufacturers, Longmont
- Machinery Movers & Erectors, Longmont
- Machinery, Supplies & Equipment - Business Production Related, Longmont
- Machinery, Supplies & Equipment - Business Supplies Related, Longmont
- Machinery, Supplies & Equipment - Construction & Contractor Related, Longmont
- Mailbox Rental Services, Longmont
- Mailing, Delivery & Courier Service, Longmont
- Maintenance, Cleaning & Sanitation, Longmont
- Major Appliances, Longmont - Household & Kitchen
- Make Up & Cosmetics Application, Longmont
- Malls & Shopping Centers, Longmont
- Management Consultants & Services, Longmont
- Manicurists & Pedicurists, Longmont
- Manufacturers Agents & Representatives, Longmont
- Manufacturers Representative, Longmont - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Longmont
- Manufacturing Equipment & Supplies, Longmont
- Manufacturing Products, Longmont
- Manufacturing Services, Longmont
- Map Publishers & Printers, Longmont
- Mapping & Topographical Services, Longmont
- Maps & Supplies, Longmont
- Marine & Lake Services, Longmont
- Marine Products And Services, Longmont
- Marine Repair & Service Stations, Longmont
- Marine Supplies & Equipment, Longmont - Boat Supplies
- Marine Supplies & Equipment Repair, Longmont - Boat Supplies & Equipment
- Marriage & Family Counselors, Longmont
- Martial Arts & Self Defense Schools, Longmont
- Masonry Contractors, Longmont - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Longmont
- Massage Therapists & Professional, Longmont
- Massage Therapy, Longmont
- Mats & Matting, Longmont
- Mattress & Bedspring Manufacturers, Longmont
- Meat Market, Wholesale & Products, Longmont
- Mechanical Contractors, Longmont - Install, Service & Repair
- Mechanical Engineer, Longmont - Mechanical Engineering Service
- Medical & Dental Assistant Schools, Longmont
- Medical & Dental Management, Longmont
- Medical & Health Service Organizations, Longmont
- Medical Diagnostic Clinics, Longmont - Clinical Labs & Centers
- Medical Equipment Manufacturers, Longmont
- Medical Identification Jewelry, Longmont
- Medical Research, Longmont
- Medical Research & Development, Longmont - Medical Information & Research
- Medical Research Facilities, Longmont - Research & Development Centers
- Medical Supplies & Equipment, Longmont
- Mediterranean Restaurants, Longmont
- Meeting & Event Planning Services, Longmont - Conference Consultants
- Membership Sports & Recreation Clubs, Longmont
- Men's & Boys Clothing & Accessories Stores, Longmont
- Men's Clothing Stores, Longmont - Clothes & Accessories
- Mens & Boys Jeans & Western Wear Stores, Longmont
- Mental Health Specialists, Longmont - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Longmont
- Merchandise Sales Events, Longmont
- Metal Buildings, Longmont - Kits, Homes, Steel Buildings, etc
- Metal Finishers, Longmont
- Metal Heat Treating, Longmont
- Metal Perforating & Punching, Longmont
- Metal Plating & Polishing, Longmont
- Metal Roofs, Longmont
- Metal Services, Longmont
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- Methodist Church, Longmont
- Mexican Food & Goods Products, Longmont
- Mexican Restaurants, Longmont
- Middle Eastern Restaurants, Longmont
- Mildew Removal & Control, Longmont - Mold Removal
- Millwork Contractors, Longmont
- Millwork Manufacturers, Longmont
- Millwrights, Longmont
- Minerals, Longmont
- Mini & Self Storage, Longmont
- Mining, Longmont
- Mining Contractors, Longmont - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Longmont - Mining Companies
- Ministries Church, Longmont
- Mirrors, Longmont - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Manufacturing, Longmont
- Miscellaneous Business Product Repair, Longmont
- Miscellaneous Household Item Repair, Longmont
- Miscellaneous Agriculture, Longmont
- Miscellaneous Business Services, Longmont
- Miscellaneous Government, Longmont
- Miscellaneous Industry, Longmont
- Miscellaneous Manufacturing, Longmont
- Miscellaneous Personal Services, Longmont
- Miscellaneous Photographers, Longmont
- Miscellaneous Professional, Longmont
- Mission Churches, Longmont
- Mobile Automobile Services, Longmont
- Mobile Home Contractors, Longmont
- Mobile Home Improvements & Repairs, Longmont
- Mobile Home Parks & Communities , Longmont
- Molds, Longmont
- Money Transfer Service, Longmont
- Monuments, Tombstones, Markers & Memorials, Longmont
- Mortgage Bankers & Correspondents, Longmont
- Mortgage Brokers, Longmont
- Mortgage Companies, Longmont
- Mortgage Contracts & Services, Longmont
- Mortgage Feasibility Consultants, Longmont
- Mortgages & Loans, Longmont
- Motion Picture & Television Production Services, Longmont
- Motion Picture Pre & Post Production Services, Longmont
- Motor Homes, Longmont
- Motor Vehicle, Longmont
- Motor Vehicle Rental & Leasing, Longmont
- Motorcycle & ATV Repair & Service, Longmont
- Motorcycle & Motor Scooters Dealers, Repair & Service, Longmont
- Motorcycle Parts, Accessories & Dealers, Longmont
- Motorcycle Repair & Service, Longmont
- Motorcycles Paint & Refinishing, Longmont
- Mountain & Rock Climbing Equipment, Longmont
- Movie Theaters, Longmont
- Moving & Storage Supplies & Equipment, Longmont
- Moving Companies, Longmont
- Moving Supplies & Equipment Rental, Longmont
- Moving Truck Rental , Longmont
- Muffler Shop & Exhaust Systems, Longmont
- Museums, Longmont
- Music, Longmont
- Music Entertainment, Longmont
- Music Schools, Longmont
- Musical Instrument Rental, Longmont - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Longmont
- Musical Instruments Repair, Sales & Service, Longmont
- Musical Recording Services, Longmont
- Musicians, Bands & Disc Jockeys, Longmont
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