Ostrów is a village in the administrative district of Gmina Magnuszew, within Kozienice County, Masovian Voivodeship, in east-central Poland. It lies approximately 3 kilometres (2 mi) south-west of Magnuszew, 24 km (15 mi) north-west of Kozienice, and 58 km (36 mi) south-east of Warsaw. The village has a population of 110. Gmina Magnuszew is a rural gmina (administrative district) in Kozienice County, Masovian Voivodeship, in east-central Poland. Its seat is the village of Magnuszew, which lies approximately 24 kilometres (15 mi) north-west of Kozienice and 57 km (35 mi) south-east of Warsaw. The gmina covers an area of 140.92 square kilometres (54.4 sq mi), and as of 2006 its total population is 6,595.