- Dairy Farm Equipment, Naperville
- Dance Companies, Naperville
- Data Communications Service, Equipment, Supplies & Sales, Naperville
- Data Networking, Naperville
- Data Processing Security Storage, Naperville
- Data Processing Services, Naperville
- Data Recovery Services, Naperville - Hard Drive Data Recovery, etc
- Day Spas, Naperville
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Naperville
- Decorating & Designing Services, Naperville
- Decorative & Stamped Concrete, Naperville
- Dehumidifying & Ventilating Equipment, Naperville - Suppliers & Wholesalers
- Delicatessen Restaurants, Naperville
- Delivery & Errand Services, Naperville
- Dental Bonding & Cosmetic Dentistry, Naperville - Cosmetic Dentist & Tooth Bonding
- Dentists, Naperville
- Department Stores, Naperville
- Dermatologists, Naperville - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designer Clothes & Accessories, Naperville
- Developmental Children Services, Naperville
- Developmental Disabilities, Naperville
- Diamonds & Precious & Semi-Precious Stones, Naperville
- Diet Center, Naperville
- Diet Centers, Naperville
- Dieticians & Diet Counseling, Naperville
- Direct Magazine Sales & Delivery, Naperville
- Direct Mail Advertising, Naperville
- Direct Mail Advertising Services, Naperville
- Direct Selling Businesses, Naperville
- Disc Jockeys, Naperville
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- Discount Stores, Naperville - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Naperville
- Dispensing Machines, Naperville
- Displays & Display Installation Service, Naperville - Trade Show Displays
- Diving Services & Instruction, Naperville
- Divorce & Family Law Attorneys & Lawyers, Naperville
- Dizziness & Balance Disorders, Naperville - Doctors, Physicians & Surgeons
- Doctorate Degree, Naperville
- Doctors, Physicians & Surgeons, Naperville
- Donuts, Naperville
- Door & Gate Operating Devices, Naperville
- Door Closers & Checks, Naperville
- Door Installation & Repair, Naperville - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Naperville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Doors Hanging & Cutting, Naperville
- Dowels Lumber, Naperville
- Draperies & Curtains Manufacturers, Naperville
- Drapery Blinds & Shades Installation & Repair, Naperville
- Dressmakers Supplies, Naperville
- Drinking Establishments, Naperville
- Driveway, Parking Lot & Blacktop Contractors, Naperville - Construction, Repair & Maintenance
- Drugs & Pharmaceutical Supplies, Naperville
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Naperville
- Dry Cleaning & Laundry, Naperville - Dry Cleaners
- Dryers Sales, Service & Repair, Naperville - Gas & Electric
- Drywall Contractors, Naperville - Drywall Repair & Installation Services
- Dumpster Rental, Naperville
- Durable & Non Durable Goods & Products, Naperville
- Durable Goods & Products, Naperville
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