This paper explores the question which consequences the use of geographical information systems (GISs) may have for public accountability. Empirical data from a Delphi-survey were used for this exploration. Respondents were asked to reflect on the consequences of GISs for the availability of data for accountability. Based on their answers four hypotheses were formulated. The use of a GIS leads to an increased focus on up-to-date data at the expense of historical data. Important data for accountability will sometimes not be retained. The use of a GIS leads to an increased need to maintain about data how, when and by whom data have been generated. This need may not be sufficiently met. In a process of accountability, data from a GIS may then be difficult to interpret or cannot be trusted. A GIS increases the possibility to look at the data in different ways. In processes of accountability for a may ask governmental organizations to substantiate the choice fora certain perspective. The use of a GIS leads to better access to the data. Therefore, data from a GIS may play a more important role in a process of accountability. These hypotheses require further attention to gain a better understanding of long-term public accountability in an information age.