Kośiłowszczyzna — zaścianek in grodzieński powiat Białystok Voivodeship of Polish Republic (Second Rzeczpospolita, 1920-1939).
Information presented on the Radzima.net: 
Catholic parish to which the zaścianek Kośiłowszczyzna belonged at the beginning of the 20th century;
metrical books of the Catholic parish on births, marriages and deaths (with indication of years, fund, inventory and archive where parish registers kept);
links to microfilms of church records (births, christenings, marriages, deaths);
Location of the zaścianek Kośiłowszczyzna
— geographic coordinates and depiction of the zaścianek Kośiłowszczyzna on early-20th-century detailed maps, modern maps, and satellite imagery (Google Maps). Administrative affiliation of the zaścianek Kośiłowszczyzna
— the administrative-territorial units to which the settlement belonged in different historical periods:— Russian Empire (1870-1910s), — Polish Republic (Second Rzeczpospolita, 1920-1939), Catholic parish to which the zaścianek Kośiłowszczyzna belonged at the beginning of the 20th century;
metrical books of the Catholic parish on births, marriages and deaths (with indication of years, fund, inventory and archive where parish registers kept);
links to microfilms of church records (births, christenings, marriages, deaths);
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