The question of whether the Job Corps's impacts on students' employment and related outcomes differ according to the characteristics of the Job Corps center attended was examined. The study sample consisted of approximately 9,400 program group members and 6,000 control group members who were randomly selected from among the nearly 81,000 applicants nationwide who applied for Job Corps services for the first time between November 17, 1994, and December 16, 1995, and were found eligible for services by February 1996. Study participants were interviewed shortly after their random assignment and 12, 30, and 48 months thereafter. Job Corps impacts were similar for contract centers and Civilian Conservation Centers. Impacts were similar in large, medium, and small centers. The beneficial impacts of the Job Corps program overall were broadly distributed throughout the country and not confined to a few regions. Impacts were similar for centers rated as high-performing, medium-performing, and low-performing centers based on the Job Corps performance measurement system. As expected, outcomes of the program group were better among the high-performing centers. However, so too were the outcomes of the control group who would have attended the high-performing centers. (Twenty-eight tables/figures are included. Eight supplementary tables are appended.) (MN)