The present work has a two-fold aim: (a) to verify the difference in civic behavior enacted by socially engaged young people in a lasting and structured form, sealed by membership in an organization, on the one hand, and in non-engaged young people, on the other hand; (b) to identify a pattern of characteristics (personal, social, and familial) able to explain civic behavior. Participants, 577 young adults from ages 19 to 29, filled out a self-report questionnaire. The results of the t test for independent samples confirm the presence of the difference between means of scores on the civic behavior. Moreover, data confirm a model in which civic behavior is predicted by personal identity, engagement values, family discussion of current events, the quality of previous membership experiences in socially oriented groups (membership), and finally, in a mediator position, by sense of community. The present study has many implications for researchers and practitioners.