In the Kingdom of Poland, Nowy Korczyn was one of the most important administrative centers of the vast province of Lesser Poland. Here Lesser Poland sejmiks took place, in which regional senators and deputies of the Sejm met to discuss and coordinate their policies. The Nowy Korczyn sejmiks included representatives from Kraków Voivodeship, Sandomierz Voivodeship, Lublin Voivodeship, Podole Voivodeship, and Volhynian Voivodeship. Furthermore, the town was the seat of a starosta (one of six "starostas" of Sandomierz Voivodeship), and the seat of court for the Wiślica and Pilzno counties.