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

[1] It lies approximately 10 kilometres (6 mi) north of Jednorożec, 25 km (16 mi) north-east of Przasnysz, and 111 km (69 mi) north of Warsaw.

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