Nisko County (powiat niżański) is a unit of territorial administration and local government (powiat) 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 km 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.
The county covers an area of 785.58 km2. As of 2019 its total population is 66,699, out of which the population of Nisko is 15,324, that of Rudnik nad Sanem is 6,710, that of Ulanów is 1,422, and the rural population is 43,243.
Nisko County is bordered by Janów Lubelski County to the north-east, Biłgoraj County to the east, Leżajsk County to the south-east, Rzeszów County to the south, Kolbuszowa County to the south-west and Stalowa Wola County to the north-west.
