- Dairy Farms, Cortland
- Dance Companies, Cortland
- Day Spas, Cortland
- Decorating & Designing Services, Cortland
- Delicatessen Restaurants, Cortland
- Denomination, Non-Denominational, Etcetera, Cortland
- Dental Bonding & Cosmetic Dentistry, Cortland - Cosmetic Dentist & Tooth Bonding
- Dentists, Cortland
- Dentures, Cortland
- Department Stores, Cortland
- Developmental Children Services, Cortland
- Developmental Disabilities, Cortland
- Developmentally Disabled Information & Services, Cortland
- Diner Restaurants, Cortland
- Direct Mail Advertising Services, Cortland
- Disability Accommodation Consultants, Cortland
- Disabled Persons Assistive Services, Cortland
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- Discount Stores, Cortland - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Cortland
- Dispensing Machines, Cortland
- Divorce & Family Law Attorneys & Lawyers, Cortland
- Doctorate Degree, Cortland
- Doctors, Physicians & Surgeons, Cortland
- Donuts, Cortland
- Door & Gate Operating Devices, Cortland
- Door Installation & Repair, Cortland - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Cortland - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Services, Cortland
- Drinking Establishments, Cortland
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Cortland
- Dry Cleaning & Laundry, Cortland - Dry Cleaners
- Drywall Contractors, Cortland - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Cortland - Installation & Repair Services
- Durable & Non Durable Goods & Products, Cortland
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