- Dams, Waterways, & Docks Contractors, Rockford
- Dance Companies, Rockford
- Day Spas, Rockford
- Decorating & Designing Services, Rockford
- Delicatessen Restaurants, Rockford
- Dental Bonding & Cosmetic Dentistry, Rockford - Cosmetic Dentist & Tooth Bonding
- Dentists, Rockford
- Department Stores, Rockford
- Dialysis Clinics, Rockford - Kidney Dialysis Centers
- Die Cutting Machine, Supplies & Equipment, Rockford
- Dies, Rockford
- Discount Stores, Rockford - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Rockford
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- Divers & Diving Professionals, Rockford
- Doctors, Physicians & Surgeons, Rockford
- Dog & Cat Foods Manufacturers, Rockford
- Dolls, Doll Houses & Accessories , Rockford
- Drainage Contractors, Rockford - Install & Repair Drainage Systems
- Dredging Companies, Rockford
- Drilling & Boring Equipment & Supplies, Rockford
- Drinking Establishments, Rockford
- Driveway, Parking Lot & Blacktop Contractors, Rockford - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Rockford
- Dry Cleaning & Laundry, Rockford - Dry Cleaners
- Dumpster Rental, Rockford
- Durable & Non Durable Goods & Products, Rockford
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