Motion Taxi: (more information) This company serves the greater Toronto area, and even has online booking. Motion Taxi currently has 28 accessible cabs in their fleet.
Dignity Transportation: (more information) Dignity serves the greater Toronto area. It offers both emergency and non-emergency transport, and has a variety of vehicles, from sedans to buses, to serve its clients.
City Taxi: (more information) City Taxi offers a “range” of wheelchair accessible vehicles. To book, call their dispatchers at the phone number listed on the link.
Scarborough City Cab: (more information) This company is “dedicated to meeting the unique transportation needs of seniors, persons with physical or mental disabilities and children with special needs by providing safe and reliable door-to-door, accessible transportation services within the Metropolitan Toronto Area.” You must call to book your trip and they do offer same day service.