Itahari Sub Metropolitan City, Nepal Breadcrumb Home Our Partners Itahari Sub Metropolitan City, Nepal Itahari is a sub-metropolitan city in the Sunsari District of Koshi Province in Nepal. It is the second most populous city in eastern Nepal after Biratnagar. Itahari has an estimated city population of 1,98,098 as per 2021 Nepal census. It is one of the fastest-growing cities in Eastern Nepal. Itahari joined the CCAC in 2023.Website here.