Administration for Refugees and Returnees Affair’s head quarter is located in Addis Ababa, the capital city.
Ethiopia -Ethiopia hosts more than 900,000 refugees from various countries of origin. ARRA hosts 366,634 from South Sudan, 253,624 from Somalia, 199,128 from Eritrea, 59,428 from Sudan, and 3,924 from Kenya in its 27 refugee camps spread across six regions in the country By the end of 2017. Moreover, there are also additional 4,223 Urban Refugees and 16,044 OCP whose origin is different counties.

Use the following link to see The Population of refugees in Ethiopia as of end of January 2018.
Ethiopia-Refugees Population As-of-Jan-31-2018