| Janówek Pierwszy | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Legionowo |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Wieliszew |
| Coordinates: | 52.4403°N 20.79°W |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Population Total: | 520 |
Janówek Pierwszy is a village in the administrative district of Gmina Wieliszew, within Legionowo County, Masovian Voivodeship, in east-central Poland.[1] It lies approximately 13km (08miles) west of Wieliszew, 100NaN0 north-west of Legionowo, and 290NaN0 north-west of Warsaw.
In 2005 the village had a population of 520.