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Although the transparency and sustainability of governments are currently of great interest to researchers, few studies have specifically addressed these issues. Nevertheless, previous research has found sustainability transparency as a key issue in government–citizen relations, especially for local governments (LGs). The aim of this article is to identify factors that promote online transparency regarding the sustainability of public policies, by means of an empirical study of 62 LGs in the United Kingdom, Ireland, and Southern Europe. Our results show that the prevailing administrative tradition may influence the degree of transparency of LGs, with population, socioeconomic, and financial factors being relevant.

Although international organizations and prior literature have recognized the importance of sustainability reporting for governments nowadays, some studies have revealed that this is an issue that has received little attention and thus needs further investigation. This article studies the publication of information on sustainability issues by local governments, analysing the relationship between diverse levels of sustainability information disclosure and some socioeconomic, financial and population variables. Based on the increased use of the Internet by governments, the methodology applied in this study is to analyse the websites of 55 major towns and cities in Spain, seeking 61 items that are recommended in the Global Reporting Initiative guidelines. By applying multiple linear regression analysis, we analysed the influence of 13 factors on the sustainability reporting provided by these municipal authorities. The results show that social information is the most widespread, and that the dependent population has a positive impact on the sustainability disclosures. The major opportunities to improve sustainability practices lie in improving the disclosure of economic and environmental information, through the publication of formal sustainability reports and the enhanced coordination of information published individually by different departments. Points for practitioners The results obtained highlight several issues of particular interest for managers. On the one hand, the public sector financial crisis has heightened the need to legitimize government actions. Moreover, the incidence of the variable ‘dependent population’ on the disclosure of sustainability information suggests that there is an important relation between the population structure and such disclosure, highlighting the need to consider the age of the population and its evolution over time as the basis for creating specific reports on sustainability. The public demand for information on sustainability does not depend on the level of taxes paid. Finally, local governments are not motivated by their level of financial autonomy with respect to information about their commitments on economic sustainability.