Siemiątkowo [ɕɛmjɔntˈkɔvɔ] is a village in the administrative district of Gmina Troszyn, within Ostrołęka County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 7 kilometres (4 mi) north-east of Troszyn, 17 km (11 mi) east of Ostrołęka, and 109 km (68 mi) north-east of Warsaw.

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