The process and topic of this final paper will be based on the definition of office operations and management within local and regional self-government units, with the focus on the operations of the City of Zaprešić. Special emphasis will be placed on the operation of the internal organizational unit of the registry and archives as one of the most important units within the administrative office, where cases are received, opened, inspected, and sent to work. Although many people pay the least attention to the registry and archives, they are essential for the good and quality functioning of the administrative office. We will also pay attention to the differences or similarities between office operations and record-keeping as well as the application of the international standard in office operations. In the theoretical part of the paper, the focus will be on the concepts of office operations that are defined in the Regulations of office management (NN 33/87, 42/88, and 7/09). Special emphasis will be on the analysis of documents that are received in the registry and the process that starts with receiving the files, storing in the registry, and their withdrawal. We will also list the legal sources of office operations and the principles applied in office operations and record keeping. The attention will be paid also to the brief process of the official evidency kept in the administrative offices for easier, faster, and better operations, as well as keeping the registration record and the register of subjects of administrative and non-administrative proceedings. At the end of the paper, we will process the archiving and extraction of cases, all followed by the example of the business of the City of Zaprešić.