Koszewo is a village in the administrative district of Gmina Brańsk, within Bielsk County, Podlaskie Voivodeship, in north-eastern Poland.
According to the 1921 census, the village was inhabited by 201 people, among whom 194 were Roman Catholic, 1 was Orthodox, and 6 were Mosaic. At the same time, all inhabitants declared Polish nationality. There were 34 residential buildings in the village.Skorowidz miejscowości Rzeczypospolitej Polskiej: opracowany na podstawie wyników pierwszego powszechnego spisu ludności z dn. 30 września 1921 r. i innych źródeł urzędowych., t. T. 5, województwo białostockie, 1924, s. 21.
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