In the context of e-Government, the modality of e-Government Services is a popular research area since it modulates the effectiveness of facilitating services to users. Here we classify the characteristics of services in e-Government into five groups: services orientation, services attributes, services organizations, levels of services adoption, and services of communication technology forms. We identify these groups by analyzing e-Government services characteristics through mapping between services characteristics, and use a systematic review of e-Government services characteristics. This study includes a discussion of the results of the taxonomy that we built and some recommendations to improve the taxonomy further. Some limitations are described. This taxonomy differs from other taxonomies by focusing on governmental services characteristics rather than governmental and nongovernmental organizations and their municipalities. In Conclusion, the taxonomy proposed here will aid decision-makers and practitioners in developing e-Government systems to facilitate communicating between supplier-side and demand-side.