This report provides statistical information and commentary about 53,554 medical students who were enrolled in the 114 U.S. medical schools during the school year 1974-75. It is the product of a comprehensive national study that is focused specifically on describing in detail the characteristics of enrolled medical students in all U.S. medical schools during a given academic year. Two approaches for analyzing and presenting the data were employed: (1) by class level, and (2) by control of medical school (i.e., public or private). Tables cover the distribution of medical students by: (1) school, sex, and class level; (2) racial/ethnic self-identity; (3) geographic origin (for foreign medical students); (4) family income; (5) father's occupation in comparison with occupational distribution of employed males 40 years old and over. (Author/KE)