This brief, the third in a series using qualitative data collected during the Hispanic Healthy Marriage Initiative Grantee Implementation Evaluation, describes the Hispanic population of the United States in terms of characteristics, such as age, gender distribution, economic indicators, educational attainment, nativity (U.S.-born vs. foreign-born), country of origin, generational status (immigrant or first generation vs. second or later generation), and linguistic preferences and proficiency. The brief then describes the populations served by nine Hispanic Healthy Marriage programs, and the implications of Hispanic diversity for service design, delivery, and evaluation.