The Brazilian federative government model comprises a Federal District, 26 states, and 5,570 municipalities, providing local governments with significant political, administrative, and financial autonomy. However, this decentralization presents various challenges regarding cross-sector governance and coordination of digital government policies. Service quality evaluation plays a crucial role in striving for improved citizen service delivery. In this context, digital government has been adopted as a strategy to enhance services, engage citizens, and modernize government institutions. This paper reports on the specification, construction, and evaluation of a method for mapping public agencies, classifying them based on their levels of digital government maturity. The objective is to identify areas with the greatest deficiencies and their key challenges. The mapping method for digital government maturity, presented as the main contribution of this study, aligns with the chapters and sections of Law No. 14,129/2021. It provides a solid foundation for analyzing and improving governmental processes, enabling effective progress toward digitization and enhancing citizen services.