Ilam district is one of 14 districts of Koshi Province of eastern Nepal. It is a Hill district and covers 1,703 km². The 2011 census counted 290,254 …Ilam district is one of 14 districts of Koshi Province of eastern Nepal. It is a Hill district and covers 1,703 km². The 2011 census counted 290,254 inhabitants. The municipality of Ilam is the district headquarters and is about 600 km from Kathmandu.