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Kosianka-Trojanówka

Kosianka-Trojanówka is a village in the administrative district of Gmina Grodzisk, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately west of Grodzisk, north-west of Siemiatycze, and south-west of the regional capital Białystok.

The village has a population of 30.