The use of information and communication technologies has become an integral part of public administration. This paper aims at defining the term 'information system', pointing out to its users and explaining how the organization of information in public administration works. Good practices and research reviews, European and Croatian, on public administration information systems will be presented. The research part of the paper will present the information needs of the citizens of Zadar, the data on their satisfaction with the public administration, and the need to introduce new technologies that would ensure efficiency and higher quality of service, which would create trust between them and public administration. The research aimed to find the best way of communication between the citizens and public administration, not to transfer the exchanged information. It was conducted using an online survey. The research results showed that the citizens were not satisfied or dissatisfied with communication with public administration. However, in the future, most of them would certainly like to use more public administration services online because, in their experience, it was not possible to solve administrative issues via the Internet. The research results suggested that the current system was unsatisfactory or non-existent, that improvements were needed to adapt to the capabilities and needs of its users who showed a strong willingness to use new technology in communication with public administration.