On 20 April 2022, the twelfth joint data collection exercise was conducted by IOM Bosnia and Herzegovina (BiH), together with the Service for Foreigners’ Affairs (SFA), and the support of the Red Cross Society BIH (RCSBH) to collect information on the number of migrants and asylum-seekers present in the country. The purpose of the exercise was to provide an estimation of the migrant population (stock) that was not accommodated or registered in any official Temporary Reception Centres (TRCs) at any given date. Fourteen teams were deployed for a total of 39 enumerators (27 males and 12 females), plus 11 SFA staff (8 males and 3 females), 13 RCSBH staff (8 males and 5 females). The data collection exercise was implemented in 7 Cantons of the Federation of Bosnia and Herzegovina (FBiH) and in 5 regions in the Republika Srpska (RS) entity. A total of 223 locations3 46 different municipalities were visited: 68 locations in 5 municipalities in Una-Sana Canton, 42 locations in 5 municipalities in Sarajevo Canton, 32 locations in 10 municipalities in Tuzla Canton, 23 locations in 4 municipalities in Herzegovina – Neretva Canton, 4 locations in 4 municipalities in West Herzegovina Canton, 4 locations in 1 municipality in Bosnian Podrinje Goražde Canton, 1 locations in 1 municipality in Canton 10, 8 locations in Zvornik, 7 locations in Višegrad, 6 locations in Bijeljina, 4 locations in Kozarska Dubica, 3 locations each in Bratunac, Foča, Rudo and Vlasenica, 2 locations each in Gradiška, Novi Grad, Rogatica and Srbac, and 1 location each in Banja Luka, Kostajnica, Milići and Prijedor.