It is becoming increasingly clear that the concepts of open government data (OGD) and co-creation are related; however, there is currently only limited empirical material available exploring the link between the two. This paper aims to help clarify the relationship between these two concepts by exploring a recently coined phenomenon: OGD-driven co-created public services. These services 1) utilize or are driven by OGD; 2) are co-created by stakeholders from different groups; and 3) produce public value for society. Due to the relative newness of the phenomenon an inductive exploratory case study is undertaken on Chicago’s use of OGD in the co-creation of their food safety inspection forecasting model. This model forecasts critical food safety violations at food serving establishments and sends inspectors to the highest risk establishments first. The results of this exploratory work led to the discovery of a ‘perfect storm’ of six factors that seem to play a key role in allowing OGD-driven public service co-creation to take place. These factors are motivated stakeholders, innovative leaders, proper communication, an existing OGD portal, external funding, and agile development.