- Dairy Farm Equipment, Rockford
- Dairy Farms, Rockford
- Dairy Products - Wholesale & Retail, Rockford
- Dance Companies, Rockford
- Darts & Dart Boards Supplies, Rockford
- Data Communications Service, Equipment, Supplies & Sales, Rockford
- Data Processing Services, Rockford
- Day Spas, Rockford
- Debt Adjusters, Rockford
- Debt And Credit Attorneys & Lawyers, Rockford
- Debt And Credit Attorneys & Lawyers, Rockford
- Debt And Credit Lawyers & Attorneys, Rockford
- Debt Consolidation, Rockford
- Debt Management Assistance & Services, Rockford
- Decals, Rockford
- Deck Cleaning & Restoration, Rockford - Clean & Seal Decks, Patios, Fences, etc
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Rockford
- Decorating & Designing Services, Rockford
- Decorative & Stamped Concrete, Rockford
- Delicatessen Restaurants, Rockford
- Delivery & Errand Services, Rockford
- Demolition Consultants, Rockford - Demolition Contractors
- Demolition Work, Rockford
- Denomination, Non-Denominational, Etcetera, Rockford
- Dental Bonding & Cosmetic Dentistry, Rockford - Cosmetic Dentist & Tooth Bonding
- Dentists, Rockford
- Department Stores, Rockford
- Dermatologists, Rockford - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designer Clothes & Accessories, Rockford
- Developmental Children Services, Rockford
- Developmental Disabilities, Rockford
- Dialysis Clinics, Rockford - Kidney Dialysis Centers
- Dictating Machines, Rockford
- Die Casting, Rockford
- Die Makers Equipment & Supplies, Rockford
- Dies, Rockford
- Diesel Engine, Rockford
- Digital Printing & Imaging Service, Rockford
- Direct Mail Advertising, Rockford
- Direct Mail Advertising Services, Rockford
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- Disability And Social Security Attorneys & Lawyers, Rockford
- Disaster Preparedness Equipment & Supplies, Rockford
- Disc Jockeys, Rockford
- Discount Stores, Rockford - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Rockford
- Dispensing Machines, Rockford
- Displays & Display Installation Service, Rockford - Trade Show Displays
- Diving Equipment & Supplies, Rockford - Scuba & Snorkel Gear & Masks Shops
- Divorce & Family Law Attorneys & Lawyers, Rockford
- Doctorate Degree, Rockford
- Doctors, Physicians & Surgeons, Rockford
- Document Imaging & Management, Rockford
- Doll Clothing & Accessories, Rockford
- Dolls, Doll Houses & Accessories , Rockford
- Donuts, Rockford
- Door & Gate Operating Devices, Rockford
- Door Installation & Repair, Rockford - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Rockford - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Equipment, Rockford
- Drafting Services, Rockford
- Drilling & Boring Equipment & Supplies, Rockford
- Drinking Establishments, Rockford
- Drive In Restaurants, Rockford
- Drive Shafts, Rockford
- Driveway Contractors - Build, Repair, Sealing, Rockford - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Driveway, Parking Lot & Blacktop Contractors, Rockford - Construction, Repair & Maintenance
- Drugs & Pharmaceutical Supplies, Rockford
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Rockford
- Dry Cleaning & Laundry, Rockford - Dry Cleaners
- Dryers Sales, Service & Repair, Rockford - Gas & Electric
- Drywall Contractors, Rockford - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Rockford
- Drywall, Insulation & Plaster Contractors, Rockford - Installation & Repair Services
- DUI Attorneys & Lawyers, Rockford - DWI - Drunk Driving
- DUI Attorneys & Lawyers, Rockford - DWI - Drunk Driving
- DUI Lawyers & Attorneys, Rockford - DWI - Drunk Driving
- Dumpster Rental, Rockford
- Durable & Non Durable Goods & Products, Rockford
- Durable Goods & Products, Rockford
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