Kostajnica (Cyrillic: Костајница) is a village in the municipality of Konjic, Bosnia and Herzegovina.Official results from the book: Ethnic composition of Bosnia-Herzegovina population, by municipalities and settlements, 1991. census, Zavod za statistiku Bosne i Hercegovine - Bilten no.234, Sarajevo 1991.
Demographics According to the 2013 census, its population was 39.
+ Ethnicity in 2013EthnicityNumberPercentage Croats 33 84.6% Bosniaks 6 15.4% Total 39 100%
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