Itahari is a town and municipality in Sunsari District in the Koshi Zone of south-eastern Nepal. It is located at the main transportation junction of eastern Nepal. It is the center of the west-east Mahendra Highway and south-north Koshi Highway and thus is a town of emerging importance. At the time of the 1991 Nepal census it had a population of 26,824 people living in 5135 individual households.