Nisko County is a unit of territorial administration and local government in Subcarpathian Voivodeship, south-eastern Poland. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and largest town is Nisko, which lies 57 kilometres north of the regional capital Rzeszów. The county also contains the towns of Rudnik nad Sanem, lying 13 km south-east of Nisko, and Ulanów, 11 km east of Nisko.