Donje Ratkovo is a village in the municipalities of Ribnik, Bosnia and Herzegovina, Republika Srpska and Ključ, 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 162, all Serbs with 112 living in the Republika Srpska part and 50 living in the Ključ part.
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