- Machine Shop & Tool Repair Service, Dover
- Machinery, Supplies & Equipment - Business Production Related, Dover
- Machinery, Supplies & Equipment - Business Supplies Related, Dover
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dover
- Mail Delivery Service, Dover
- Mailbox Rental Services, Dover
- Mailing, Delivery & Courier Service, Dover
- Major Appliances, Dover - Household & Kitchen
- Malls & Shopping Centers, Dover
- Management Consultants & Services, Dover
- Manicurists & Pedicurists, Dover
- Manufacturing, Dover
- Manufacturing Services, Dover
- Marking, Stamping & Engraving Equipment, Dover
- Marriage & Family Counselors, Dover
- Marriage Certificates, Dover
- Martial Arts & Self Defense Schools, Dover
- Masonry Contractors, Dover - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Dover
- Massage Therapists & Professional, Dover
- Massage Therapy, Dover
- Mats & Matting, Dover
- Meat Brokers, Dover
- Medical & Dental Management, Dover
- Medical & Health Service Organizations, Dover
- Medical Alert Systems, Dover - Medical Alarms - PERS
- Medical Billing Services, Dover
- Medical Groups & Clinics, Dover - Medical & Health Centers
- Medical Management & Business Administration Service, Dover
- Medical Records Service , Dover
- Medical Supplies & Equipment, Dover
- Men's Clothing Stores, Dover - Clothes & Accessories
- Men's Shoe Stores, Dover
- Mennonite Church, Dover
- Mental Health Clinics, Dover - Treatment Centers
- Mental Health Specialists, Dover - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Dover
- Merle Norman Cosmetics, Dover
- Metal Coating & Allied Services, Dover
- Metal Cutting Machines, Dover
- Metal Cutting Services, Dover
- Metal Detecting Equipment, Dover
- Metal Working Machinery, Dover
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- Methodist Church, Dover
- Mexican Restaurants, Dover
- Middle Eastern Restaurants, Dover
- Midwives, Dover
- Military Supplies, Dover
- Millwrights, Dover
- Mini & Self Storage, Dover
- Mining, Dover
- Ministries Church, Dover
- Miscellaneous Business Product Repair, Dover
- Miscellaneous Household Item Repair, Dover
- Miscellaneous Business Services, Dover
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Dover
- Miscellaneous Government, Dover
- Miscellaneous Industry, Dover
- Miscellaneous Manufacturing, Dover
- Miscellaneous Personal Services, Dover
- Miscellaneous Photographers, Dover
- Miscellaneous Professional, Dover
- Mobile Home Contractors, Dover
- Mobile Home Improvements & Repairs, Dover
- Mobile Home Parks & Communities , Dover
- Mobile Homes for Rent & Lease, Dover
- Modular & Mobile Homes For Sale, Dover - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Dover
- Mortgage Companies, Dover
- Mortgages & Loans, Dover
- Motor Vehicle, Dover
- Motor Vehicle Rental & Leasing, Dover
- Motorcycle & Motor Scooters Dealers, Repair & Service, Dover
- Motorcycle Parts, Accessories & Dealers, Dover
- Motorcycle Repair & Service, Dover
- Movie Theaters, Dover
- Moving & Storage Supplies & Equipment, Dover
- Moving Companies, Dover
- Moving Truck Rental , Dover
- Muffler Shop & Exhaust Systems, Dover
- Mulch, Peat & Moss Products, Dover
- Museums, Dover
- Music, Dover
- Music Schools, Dover
- Musical Instruments & Equipment Stores, Dover
- Musical Recording Services, Dover
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