This study examined exposure to AIDS information from mass media and interpersonal communication among a nonprobability sample of Hispanic and Angle lower middle-class adolescents. Subjects were drawn predominantly from community health clinics, word of mouth recruiting, public service announcements, churches, schools, and health fairs in San Diego County. Both Hispanic (n = 220) and Angle (n = 153) youths reported substantial exposure to information about AIDS from both mass media and interpersonal communication. Hispanics watched more general television than Angles, but had less exposure to newspapers and interpersonal communication with friends. Communication among friends was most consistently related to sociodemographic variables, with older, higher status persons and girls communicating to the greatest extent. Boys reported the greatest communication with family. Angle youths had greater exposure to information about AIDS and condoms regardless of the medium of communication, while Hispanic adolescents had greater exposure to information on risks of IV drug use. Of the three main types of mass media, print and radio provided the most exposure to AIDS information. It is important for preventive medicine practitioners to exploit these differences in communication patterns when planning preventive intervention strategies that target specific adolescent populations.