- Machinery, Supplies & Equipment - Business Supplies Related, Douglas
- Machinery, Supplies & Equipment - Construction & Contractor Related, Douglas
- Major Appliances, Douglas - Household & Kitchen
- Management Consultants & Services, Douglas
- Manicurists & Pedicurists, Douglas
- Manufacturing, Douglas
- Manufacturing & Industrial Consultants, Douglas
- Marriage & Family Counselors, Douglas
- Masonry Materials & Supplies, Douglas
- Meat Market, Wholesale & Products, Douglas
- Medical & Dental Management, Douglas
- Medical Groups & Clinics, Douglas - Medical & Health Centers
- Medical Supplies & Equipment, Douglas
- Men's Clothing Stores, Douglas - Clothes & Accessories
- Mental Health Specialists, Douglas - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Douglas
- Mexican Restaurants, Douglas
- Mini & Self Storage, Douglas
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- Mining, Douglas
- Mining Contractors, Douglas - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Douglas - Mining Companies
- Miscellaneous Government, Douglas
- Miscellaneous Personal Services, Douglas
- Miscellaneous Professional, Douglas
- Money Transfer Service, Douglas
- Monuments, Tombstones, Markers & Memorials, Douglas
- Mortgages & Loans, Douglas
- Motor Vehicle, Douglas
- Motor Vehicle Rental & Leasing, Douglas
- Moving Supplies & Equipment Rental, Douglas
- Moving Truck Rental , Douglas
- Music, Douglas
- Musical Instrument Rental, Douglas - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Douglas
- Musical Instruments - Guitars, Douglas
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