The General State Archives (GAK)  are the official public service responsible for collecting, organizing, preserving, and providing access to government documents and historical records. The department on Leros is responsible for Leros, Kalymnos, Astypalaia, Patmos, Leipsoi, Arkoi, and Agathonisi

Their main functions include:

• Preserving administrative and historical documents, such as civil registry records, official decisions, contracts, maps, and photographs.

• Organizing and cataloging archives to ensure documents are safely stored and easily accessible.

• Providing public access for historians, researchers, and citizens seeking information on administrative, legal, or historical matters.

• Digitizing records to enable online access to many archival materials.