Existing research argues that studies of the value of public libraries support libraries by demonstrating their worth to society. Knowledge of research methods, value and research gaps can potentially strengthen the field of value research and support policymaking and development of libraries. Among 16,683 records retrieved from a systematic literature search, 39 studies were selected for systematic review within this topic. Findings indicate that studies focus on examining libraries as valued community assets in several aspects. It is recommended that further research explore how library services enhance democracy, reading and culture. Moreover, further research is needed that systematically reviews how libraries articulate their value to stakeholders. Concluding remarks state that value can be a robust measure for emphasising and developing libraries' worth towards society. By systematically reviewing how value is emphasised in activities, libraries are provided with the means to advocate political empathy and to develop towards community needs.