- Dairy Farm Equipment, Ottawa
- Dairy Farms, Ottawa
- Dairy Products - Manufacturers, Ottawa
- Dairy Products - Wholesale & Retail, Ottawa
- Dams, Waterways, & Docks Contractors, Ottawa
- Dance Clubs, Ottawa
- Dance Companies, Ottawa
- Darts & Dart Boards Supplies, Ottawa
- Data Communications Service, Equipment, Supplies & Sales, Ottawa
- Data Processing Services, Ottawa
- Data Recovery Services, Ottawa - Hard Drive Data Recovery, etc
- Day Spas, Ottawa
- Dead Stock Removal, Ottawa
- Deaf Services, Ottawa
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Ottawa
- Decorating & Designing Services, Ottawa
- Delicatessen Products Manufacturers, Ottawa
- Delicatessen Restaurants, Ottawa
- Demolition Consultants, Ottawa - Demolition Contractors
- Demolition Work, Ottawa
- Dental Clinics, Ottawa
- Dental Hygienists, Ottawa
- Dental Laboratories, Ottawa
- Dental Service Organizations, Ottawa
- Dental Supplies & Equipment, Ottawa
- Dental Technicians, Ottawa
- Dentists, Ottawa
- Denturists, Ottawa
- Deodorant, Disinfectants & Germicides, Ottawa
- Department Stores, Ottawa
- Dermatologists, Ottawa - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designer Clothes & Accessories, Ottawa
- Designers, Ottawa
- Desktop Publishing, Ottawa
- Diagnostic Equipment Medical, Ottawa
- Diamonds & Precious & Semi-Precious Stones, Ottawa
- Diaper Products, Ottawa
- Dictating Machines, Ottawa
- Die Casting Machinery Molds, Ottawa
- Die Cutting Machine, Supplies & Equipment, Ottawa
- Dies, Ottawa
- Diesel, Ottawa - Engine Fuels, Oils & Lubricants
- Diesel Engine, Ottawa
- Dietetic Restaurants, Ottawa
- Digital Printing & Imaging Service, Ottawa
- Digital Video Disc (Dvd) Production, Ottawa
- Dimension Stone Products, Ottawa
- Diner Restaurants, Ottawa
- Direct Mail Advertising, Ottawa
- Direct Mail Advertising Services, Ottawa
- Direct Selling Businesses, Ottawa
- Dirt, Ottawa
- Disabled Help Aids & Supplies, Ottawa
- Disaster Insurance, Ottawa
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- Disc Jockeys, Ottawa
- Disciples Of Christ Church, Ottawa
- Discotheques, Ottawa
- Discount Stores, Ottawa - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Ottawa
- Dishwashers Sales, Service & Repair, Ottawa
- Dispensing Machines, Ottawa
- Display Fixtures & Materials, Ottawa
- Displays & Display Installation Service, Ottawa - Trade Show Displays
- Distribution Centers, Ottawa
- Distribution Services, Ottawa
- Divers & Diving Professionals, Ottawa
- Diving Equipment & Supplies, Ottawa - Scuba & Snorkel Gear & Masks Shops
- Diving Instruction, Ottawa
- Divorce & Family Law Attorneys & Lawyers, Ottawa
- Divorce Information Bureaus, Ottawa
- Dock Construction - Build & Repair, Ottawa - Dock Builders
- Doctorate Degree, Ottawa
- Doctors, Physicians & Surgeons, Ottawa
- Dog & Cat Foods, Ottawa
- Dog Breeders, Ottawa
- Donuts, Ottawa
- Door & Gate Operating Devices, Ottawa
- Door Closers & Checks, Ottawa
- Door Installation & Repair, Ottawa - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Ottawa - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Doors Fire Resistant, Ottawa
- Doors Folding & Pocket, Ottawa
- Doors Glass & Mirrors, Ottawa
- Doors Revolving & Swinging, Ottawa
- Doors Rolling & Sliding, Ottawa
- Drafting Services, Ottawa
- Drainage Contractors, Ottawa - Install & Repair Drainage Systems
- Drama Schools, Ottawa
- Drapery Blinds & Shades Installation & Repair, Ottawa
- Drapery Hardware & Blinds & Shades Manufacturers, Ottawa
- Draught Proofing Contractors, Ottawa
- Drawing Materials, Ottawa
- Dressmakers Supplies, Ottawa
- Drilling & Boring Equipment & Supplies, Ottawa
- Drinking Establishments, Ottawa
- Driveway, Parking Lot & Blacktop Contractors, Ottawa - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Ottawa
- Dry Cleaning & Laundry, Ottawa - Dry Cleaners
- Dryers Sales, Service & Repair, Ottawa - Gas & Electric
- Drywall Contractors, Ottawa - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Ottawa - Installation & Repair Services
- Duct Work & Duct Supplies & Equipment, Ottawa
- Dunlop Tires, Ottawa - Dealers
- Durable & Non Durable Goods & Products, Ottawa
- Durable Goods & Products, Ottawa
- Duty Free Shops, Ottawa
- Dwelling Operators Except Apartment, Ottawa
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