Itahari (Nepali: ईटहरी) is a sub-metropolitan city in the Sunsari District of Province No. 1 of Nepal. Itahari city is business hub of eastern Nepal. It is the second most populous city in Eastern Nepal after Biratnagar. Situated at a distance of 25 kilometres north of the provincial capital of Biratnagar, 16 kilometres south of Dharan and 92 kilometres west of Kakarbhitta, Itahari serves as a junction point of the east-west Mahendra highway and the north–south Koshi highway. Itahari has an estimated city population of 1,98,098 living in 40,207 households as per 2021 Nepal census. It is one of the fastest growing cities of Eastern Nepal. It is one of the cities of the Greater Birat Development Area which incorporates the cities of Biratnagar-Itahari-Gothgau-Biratchowk-Dharan primarily located on the Koshi Highway in Eastern Nepal, with an estimated total urban agglomerated population of 804,300 people living in 159,332 households