Estimates indicate that savings yielded by this program reached around thirty-five million euros by 2020 owing to the decrease in administrative costs that it has brought about (Open Data Impact, Juliet McMurren et al., 2017). In addition, the private sector expected a return of sixty-seven million euros owing to the program’s promotion of digital services, facilitation of administrative processes, and reduction of costs (Open Data Impact, Juliet McMurren et al., 2017). Lastly, citizens might obtain benefits from integrated public services. We have organized our analysis of the main decisions and projects that the City of Copenhagen has adopted according to the principal topics and themes summarized above. 115 Quélin and Smadja | HEC PARIS | SMART CITIES | The sustainable program of six leading cities | 2021