The Task Force on Community Preventive Services conducted systematic reviews to evaluate the effectiveness of interventions to improve targeted vaccination coverage (i.e., coverage with vaccines recommended for some but not all persons in an age range on the basis of risk for exposure or disease) among adults aged <65 years at high risk when implemented alone (single-component interventions) and in combination with other interventions (multicomponent interventions). A 1999 report by the Task Force examined the effectiveness of interventions to increase coverage with universally recommended vaccinations (i.e., vaccines recommended for all persons in particular age groups). Three targeted vaccinations recommended for populations at risk are addressed in this review: influenza, pneumococcal polysaccharide, and hepatitis B. The Task Force identified evidence that certain combinations of interventions have improved vaccination coverage. To increase targeted vaccination coverage, the Task Force recommends a combination of interventions that include selected interventions from two or three categories of interventions (i.e., increasing community demand for vaccinations, enhancing access to vaccination services, and provider- or system-based interventions). The Task Force also recommends provider reminders, when implemented alone, to improve targeted vaccination coverage. This report provides additional information about population-based interventions to improve the coverage of influenza, pneumococcal polysaccharide, and hepatitis B vaccines among populations at risk, briefly describes how the reviews were conducted, and provides information that can help in applying the interventions locally.