Janówek Pierwszy

Janówek Pierwszy is a village in the administrative district of Gmina Wieliszew, within Legionowo County, Masovian Voivodeship, in east-central Poland. It lies approximately 13 km west of Wieliszew, 10 km north-west of Legionowo, and 29 km north-west of Warsaw.

In 2005 the village had a population of 520.