Elections to the various legislatures in Bosnia and Herzegovina are carried out using open Party-list proportional representation. Constituencies are numbered and are known as electoral units.
House of Representatives of Bosnia and Herzegovina
For elections to the House of Representatives of Bosnia and Herzegovina, each of the eight units is contained completely within one entity of Bosnia and Herzegovina. In the Federation of Bosnia and Herzegovina, two cantons make up a unit; whereas in Republika Srpska, units are based on municipalities. Entity#BoundariesSeatsFederation of Bosnia and Herzegovina1stUna-Sana Canton and Canton 1032ndHerzegovina-Neretva Canton and West Herzegovina Canton33rdSarajevo Canton and Bosnian-Podrinje Canton Goražde44thZenica-Doboj Canton and Central Bosnia Canton65thPosavina Canton and Tuzla Canton5Republika Srpska1stThe westmost stretch of Republika, extending far enough east to include the municipalities of Kotor Varoš, Čelinac, Prnjavor and Srbac32ndThe remainder of Republika, either side of the Brčko district33rdThe southmost stretch of Republika, extending far enough north to include the municipality of Zvornik3
House of Representatives of the Federation of Bosnia and Herzegovina
There are twelve units for elections to the subnational House of Representatives of the Federation of Bosnia and Herzegovina. Five are cantons at large, three are sections of more populous cantons, and four contain whole small cantons and sections of larger ones. #Canton/DistrictBoundariesSeats1stUna-Sana CantonWhole Canton92ndPosavina CantonAll of Brčko and Posavina, and the Tuzla Canton Municipalities of Gradačac, Doboj East and Gračanica5Brčko DistrictTuzla Canton3rdTuzla, Lukavac, Srebrenik and Čelić74thSouthern half45thZenica-Doboj CantonZavidovići, Zenica and everything farther north86thSouthern half48thCentral Bosnia CantonWhole Canton99thHerzegovina-Neretva CantonWhole Canton810thWest Herzegovina CantonWhole Canton37thBosnian-Podrinje Canton GoraždeBPK and the southern part of Sarajevo, including Novi Grad and Ilidža6Sarajevo Canton11thThe remainder of Sarajevo712thCanton 10Whole Canton3
National Assembly of Republika Srpska
The nine units for the National Assembly of Republika Srpska are based on municipalities. The current unit boundaries were drawn up for the 2014 election. #BoundariesSeats1stThe area bounded by the IEBL and the outer borders of the municipalities of Prijedor and Kozarska Dubica72ndMunicipalities of Gradiška, Laktaši, Srbac and Prnjavor73rdThe area bounded by the IEBL and the outer borders of the municipalities of Kotor Varoš, Čelinac and Banja Luka124thMunicipalities of Brod, Derventa, Vukosavlje and Modriča45thMunicipalities of Doboj, Stanari, Teslić and Petrovo66thThe area from the city of Bijeljina to Šamac, including the Brčko District97thThe municipalities of Osmaci, Zvornik, Šekovići, Vlasenica, Bratunac, Srebrenica and Milići78thThe area bounded by the IEBL and the outer borders of the municipalities of Rogatica and Han Pijesak49thEverything south of the municipalities of Novo Goražde and Višegrad7
Previously there were six constituencies. In 2014, three of the most populous units were split and the remaining units were renumbered: Old UnitsNew Units1st1st2nd2nd3rd3rd4th5th4th6th5th7th8th6th9th
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