This paper presents and discusses the general findings and key policy messages of the 2019 OECD Open, Useful and Re-usable data (OURdata) Index, and provides a detailed analysis of the results for each pillar and sub-pillar. Additionally, it assesses the main advancements and challenges related to the design and implementation of open government data (OGD) policies in OECD member and partner countries by comparing the results for 2019 with those of the 2017 edition. This policy paper contributes to the OECD work on the digital transformation of the public sector, including digital government and data-driven public sector and open government data.