The aim of this research was to identify the number and characteristics of adults under the age of 65 with a diagnosis of traumatic brain injury (TBI) living in long-term care homes (nursing homes, homes for the aged and charitable homes) in Ontario, Canada. Methods: The study used a cross-sectional design. Secondary data analysis of a comprehensive provincial database of long-term care homes was conducted. Results: Of the 399 residents coded as having a TBI, 154 were < 65 years of age. Virtually all residents were limited in personal care and required assistance for eating (94.2%), toileting (92.2%) and dressing (99.4%). A large percentage also required care for challenging behaviours, while care needs due to substance abuse was common among 12.3% of TBI residents. Conclusion: As similar research in Australia has found, young persons in long-term care homes in Ontario, Canada, have high level personal health needs, however the appropriateness of this environment is questionable.