- Machine Shop & Tool Repair Service, Guilford
- Machinery, Supplies & Equipment - Business Production Related, Guilford
- Machinery, Supplies & Equipment - Business Supplies Related, Guilford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Guilford
- Mailbox Rental Services, Guilford
- Mailing, Delivery & Courier Service, Guilford
- Major Appliances, Guilford - Household & Kitchen
- Mammography Clinics, Guilford - Breast Cancer Screening
- Management Consultants & Services, Guilford
- Manicurists & Pedicurists, Guilford
- Manufacturing, Guilford
- Marinas & Marina Services, Guilford
- Marine Supplies & Equipment, Guilford - Boat Supplies
- Market Research & Analysis , Guilford - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Guilford
- Marriage & Family Counselors Information & Referrals, Guilford
- Martial Arts & Self Defense Schools, Guilford
- Masonry Contractors, Guilford - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Guilford
- Massage Therapy, Guilford
- Mausoleum Builders, Guilford
- Meat Market, Wholesale & Products, Guilford
- Mechanical Contractors, Guilford - Install, Service & Repair
- Mechanical Engineer, Guilford - Mechanical Engineering Service
- Medical & Health Service Organizations, Guilford
- Medical Alert Systems, Guilford - Medical Alarms - PERS
- Medical Billing Services, Guilford
- Medical Diagnostic Clinics, Guilford - Clinical Labs & Centers
- Medical Supplies & Equipment, Guilford
- Membership Sports & Recreation Clubs, Guilford
- Mental Health Clinics, Guilford - Treatment Centers
- Mental Health Specialists, Guilford - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandising & Marketing Consultants, Guilford
- Metal Tablets, Guilford
- Metal Working Machinery, Guilford
- Mexican Restaurants, Guilford
- Mini & Self Storage, Guilford
- Mirrors, Guilford - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Guilford
- Miscellaneous Business Services, Guilford
- Miscellaneous Government, Guilford
- Miscellaneous Personal Services, Guilford
- Miscellaneous Photographers, Guilford
- Miscellaneous Professional, Guilford
- Model Trains, Guilford
- Modular & Mobile Homes For Sale, Guilford - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Guilford
- Mortgage Bankers & Correspondents, Guilford
- Mortgage Companies, Guilford
- Motion Picture & Television Production Services, Guilford
- Motor Vehicle, Guilford
- Motor Vehicle Rental & Leasing, Guilford
- Moving & Storage Supplies & Equipment, Guilford
- Moving Companies, Guilford
- Moving Truck Rental , Guilford
- Muffler Shop & Exhaust Systems, Guilford
- Museums, Guilford
- Music, Guilford
- Music Lessons, Guilford
- Music Lessons - Instrumental, Guilford
- Music Lessons - Vocal, Guilford
- Musical Instrument Rental, Guilford - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Guilford
- Musical Instruments Repair, Sales & Service, Guilford
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