- Dairy Farm Equipment, Janesville
- Dairy Products - Wholesale & Retail, Janesville
- Dance Companies, Janesville
- Data Communications Service, Equipment, Supplies & Sales, Janesville
- Data Processing Services, Janesville
- Day Spas, Janesville
- Deck Cleaning & Restoration, Janesville - Clean & Seal Decks, Patios, Fences, etc
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Janesville
- Decorating & Designing Services, Janesville
- Decorative & Stamped Concrete, Janesville
- Dehumidifying & Ventilating Equipment, Janesville - Suppliers & Wholesalers
- Delicatessen Restaurants, Janesville
- Delivery & Errand Services, Janesville
- Denomination, Non-Denominational, Etcetera, Janesville
- Dental Bonding & Cosmetic Dentistry, Janesville - Cosmetic Dentist & Tooth Bonding
- Dental Hygienists, Janesville
- Dentists, Janesville
- Deodorant, Disinfectants & Germicides, Janesville
- Department Stores, Janesville
- Developmental Disabilities, Janesville
- Diabetes Doctors, Janesville - Endocrinologists Physicians & Surgeons
- Dialysis Clinics, Janesville - Kidney Dialysis Centers
- Diamonds & Precious & Semi-Precious Stones, Janesville
- Diesel Engine, Janesville
- Diesel Engine Repair & Service, Janesville
- Dieticians & Diet Counseling, Janesville
- Digital Printing & Imaging Service, Janesville
- Direct Mail Advertising, Janesville
- Direct Mail Advertising Services, Janesville
- Dirt, Janesville
- Disability Accommodation Consultants, Janesville
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- Disabled Persons Assistive Services, Janesville
- Disciples Of Christ Church, Janesville
- Discount Stores, Janesville - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Janesville
- Dispensing Machines, Janesville
- Divorce & Family Law Attorneys & Lawyers, Janesville
- Divorce Counseling & Mediation, Janesville
- Doctorate Degree, Janesville
- Doctors, Physicians & Surgeons, Janesville
- Donuts, Janesville
- Door & Gate Operating Devices, Janesville
- Door Installation & Repair, Janesville - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Janesville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Doors & Door Frames Manufacturers, Janesville
- Doors & Windows Manufacturers, Janesville
- Drinking Establishments, Janesville
- Driveway, Parking Lot & Blacktop Contractors, Janesville - Construction, Repair & Maintenance
- Driving Proficiency Testing, Janesville
- Drug Screening Services, Janesville
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Janesville
- Dry Cleaning & Laundry, Janesville - Dry Cleaners
- Dryer Vent Cleaning, Repair & Installation, Janesville
- Dryers Sales, Service & Repair, Janesville - Gas & Electric
- Drywall Contractors, Janesville - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Janesville
- Drywall, Insulation & Plaster Contractors, Janesville - Installation & Repair Services
- Dump Truck, Janesville
- Dumpster Rental, Janesville
- Durable & Non Durable Goods & Products, Janesville
- Durable Goods & Products, Janesville
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