| Upper Canada Fuels - Oil Refinery |
| United Steelworkers of America - Labor Organizations |
| United Survivors Support Centre - Mental Health Specialists |
| United Way of Oshawa Whitby Claringt - Fund Raising Consultants & Organizations |
| United Way of Oshawa Whitby Claringt - Information Bureaus & Services |
| Universal Dry Cleaners - Cleaners |
| Universal Transmission - Auto Transmissions |
| University of Ontario Institute of Te - School Colleges & Universities |
| University of Ontario Institute of Te - School Colleges & Universities |
| Uphoff H Printing Inc - Printers Services |
| Upper Canada Funding - Mortgage Services |
| Upper Canada Funding Inc - Loans Personal |
| Upper Canada Funding Inc - Mortgage Lender |
| Upper Canada Travel Service - Airline Ticket Agencies |
| Ups Store The - Facsimile Repair & Service |
| Ups Store The - Facsimile Repair & Service |
| Urban Oasis - Gift Shop |
| Ure-Tech Services Inc - Playground Equip |
| Used Parts Plus - All Terrain Vehicles |
| United Rentals - Equipment Rental Agency |
| U & I Cleaners - Laundromat |
| U Save Variety - Automobile Rental U-Save |
| U Save Variety - Variety Store |
| U-Haul Co Ltd - Moving Equip & Supls Rental |
| U-Haul Co Ltd - Moving Equip & Supls Rental |
| U-Haul Moving & Storage at Taunton Rd - Truck Rental Agency |
| U-Neek Electronics - Satellite Television Equip & Systems Service & Rep |
| Ukrainian Catholic Church of St Ge - Church & Religious Associations & Organizations |
| Ukrainian Christian Pentecostal Chu - Church & Religious Associations & Organizations |
| Ukrainian Credit Union Limited - Credit Union |
| Ukrainian Cultural Centre Dnipro - Banquet Facilities |
| Ultimate Car Audio - Automotive Radios & Stereo Systems |
| Ultimate Cut Unisex The - Beauty Salon |
| Ultimate Sewing Centre - Sewing Shop |
| Unemployed Help Centre - Employment Svc Government Company Fraternal |
| Unemployed Help Centre - Employment Svc Government Company Fraternal |
| Unique Shoe Repair - Shoe Dyeing |
| United Concrete - Builders & Contractors |
| United Lumber & Building Suppli - Building Materials & Supls |
| United Paving - Paving Contractor |
| United Pentecostal Church - Church & Religious Associations & Organizations |
| United Rentals of Canada - Equipment Rental & Service |
| United Rentals of Canada Inc - Equipment Rental & Service |
| URGENT CARE - North Oshawa Medical Centre - General Practitioner |
| Urban Barn - Furniture Store |
| United Elevator Ltd - Elevator Service |