During the Trust Territory (TTPI) period, Kosrae was initially administered as one of the municipalities of the Ponape (Pohnpei) District, but in 1977 became a separate district.
Durante o período de territorio en fideicomiso (TTPI), Kosrae administrouse inicialmente como un dos municipios do Distrito de Ponape (Pohnpei), pero en 1977 converteuse nun distrito separado.