Since Polish administrative reorganization (in 1999), Brzesko has been the administrative capital of Brzesko County in Lesser Poland Voivodeship. Before reorganization it was part of Tarnów Voivodeship (1975–1998).
Brzesko's role as an administrative center dates back to Polish administrative reforms in 1999, when it became the hub for Brzesko County in Lesser Poland Voivodeship. Prior to this, from 1975 to 1998, it was part of Tarnów Voivodeship.