Olszewka [ɔlˈʂɛfka] is a village in the administrative district of Gmina Sońsk, within Ciechanów County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 6 kilometres (4 mi) north-east of Sońsk, 11 km (7 mi) south-east of Ciechanów, and 69 km (43 mi) north of Warsaw.

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