- Machinery, Supplies & Equipment - Business Production Related, Hertford
- Management Consultants & Services, Hertford
- Manicurists & Pedicurists, Hertford
- Manufacturing, Hertford
- Marinas & Marina Services, Hertford
- Marine Supplies & Equipment, Hertford - Boat Supplies
- Masonry Materials & Supplies, Hertford
- Medical Groups & Clinics, Hertford - Medical & Health Centers
- Medical Supplies & Equipment, Hertford
- Meeting & Event Planning Services, Hertford - Conference Consultants
- Membership Sports & Recreation Clubs, Hertford
- Mental Health Clinics, Hertford - Treatment Centers
- Mental Health Specialists, Hertford - Psychologist, Psychiatrist, Psychotherapist, etc
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- Mentoring, Hertford
- Methodist Church, Hertford
- Mini & Self Storage, Hertford
- Ministries Church, Hertford
- Miscellaneous Government, Hertford
- Miscellaneous Professional, Hertford
- Mobile Home Parks & Communities , Hertford
- Modular & Mobile Homes For Sale, Hertford - Manufactured Homes Sale & Service
- Moisture & Vapor Control, Hertford
- Motor Vehicle, Hertford
- Motor Vehicle Rental & Leasing, Hertford
- Moving Truck Rental , Hertford
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