Open data is a somewhat new phenomenon that is increasingly attracting attention from researchers in the academic and practitioner fields. The transformative potential of open data is being examined from various directions and in an interdisciplinary fashion. While major attention has been paid to technical aspects of open data there remains a paucity of research into usage and theoretical contributions. This study aims to examine the factors that influence citizens use of open data. In so doing, we attempt to address the paucity of theory building around open data. We further highlight the potential role that the prominent factors in co-creation can play in engaging the citizen in open data use.