Csíkszék (Hungarian pronunciation:[ˈt͡ʃiːkseːk]) was one of the Székelyseats in the historical Székely Land.
It administered two sub-seats (Hungarian: fiúszék, Latin: sedes filialis), namely Gyergyószék and Kászonszék. It was divided on the natural borders of the region, as the main territory of Csíkszék lied in the valley of the Olt River, Gyergyószék lied in the valley of Maros, while Kászonszék lied in the valley of Kászon.
Population
The religious make-up of Csíkszék in 1867 was the following: