 As of 2019 its total population is 64,411.The most populated towns are Olesno with 9,374 inhabitants and Praszka with 7,655 inhabitants.Olesno County is bordered by Wieruszów County and Wieluń County to the north, Kłobuck County to the east, Lubliniec County to the south-east, Strzelce County to the south, Opole County to the south-west, and Kluczbork County to the west.