Four regional TBI rehabilitation and prevention centers funded by the Rehabilitation Services Administration surveyed constituents concerning their participation in productive activities and the medical and rehabilitation services they had utilized within the preceding month. Analysis revealed that both productivity and service utilization were affected by geographical location, age at time of survey, educational level, gender, severity of injury, and time since injury. Persons who were most severely injured were more likely to be less productive and to utilize more services. The relationship between productivity and service utilization requires further systematic research.