| I.D.A. - Eastview Pharmacy - Pharmacy |
| Irving A Burton Limited - Bankruptcy Service |
| I M C Electric Ltd - Electric Contractors |
| I W Enterprises - Heating & Ventilating Contractors |
| Iafrate Power Consultants Inc - Engineers Consulting |
| Ian Goodall Photography - Digital Imaging Service |
| Ibiza Ltd - Clothes & Accessories Women |
| Ice Sports - Stadiums Coliseums Arenas & Athletic Fields |
| Icing by Claire's - Fashion Accessories |
| Icons Comics & Collectables - Book Dealers Comic |
| Iga Stores - Grocery Store |
| Images Beauty Salon & Barbara Shop - Barber & Beauty Shops |
| Imagination Edge - Consultants - Marketing |
| Immanuel Christian School - School Secondary & Elementary |
| Infinite Healing Chiropractic - Chiropractor |
| In Season - Kitchen Supply Store |
| Independent Concert Productions - Concert Hall |
| Indian Motorcycle Oshawa - Motorcycles & Mini Bikes Supls & Parts |
| Indogneeto - Pet Foods Equip & Supls |
| Industrial Systems Engineering - Engineers Consulting |
| Infoplace Ticket Centres Ltd - Ticket Sales Events |
| Infoplace Ticket Centres Ltd - Ticket Sales Events |
| Informed Personal Health Records - Medical & Health Information |
| Inkas Security Services - Security Guard & Patrol Services |
| Inspired Styles - Beauty Salon |
| Integrity Financial - Financial Planning Consultants & Services |
| Inter Church Health Ministries - Holistic Health Services |
| Intercede Services - Social & Human Services Organizations |
| Interior Woodcraft Design - Kitchen Cabinets & Equip Household |
| Interlinks - Internet Products & Services |
| Intermodal Transportation - Inspection Bureaus |
| International Brotherhood of - Associations Societies & Foundations |
| International Clothier - Clothes & Accessories Men |
| International Freight Systems Inc - Transportation Service |
| International News - Convenience Store |
| International Pool and Spa Center Oshawa - Spas Saunas Hot Tubs & Whirlpools |
| International Tire - Tire Shop |
| Intune Auto - Auto Repair Shop |
| Investment Planning Counsel - Investment Dealers |
| Investment Planning Counsel - Financial Planning Consultants & Services |
| Invitations & Personalizing - Invitation Printing Service |
| Is2 Staffing Service Inc - Employment Agency |
| Iseco Safety Shoes A Division of Ind - Safety Equip & Clothing |
| Isla Skye Scottish Gifts - Jeweler |
| Island Ink-Jet - Computers & Equip |
| Isomedix - Sterilizing Service |
| It Is Written - Church & Religious Associations & Organizations |
| It's Worth Repeating Ltd - Clothes & Accessories Bought & Sold |
| Iwheels Oshawa Dedicated - Transportation Service |
| I.D.A. - Scotts Drug Mart - Pharmacy |
| Iris Optometrists And Opticians - Optometrist |
| Infrared Cellphone Repair - Electrical Supply Store |
| International Pool and Spa Center - Pool Supplies |
| IRIS - Optometrist |