Hariwan Municipality is one of the new municipalities declared by the Government of Nepal on May 18, 2014. It is located in Sarlahi District Janakpur zone, Nepal. It is formed by the joining of four contemporary Village development committees (VDCs) namely Atrouli, Sasapur, Ghurkauli and Harion VDCs covering an area of 88.1 km2. It has been divided into 11 wards with an administration center in Harion Bazar. According to Nepal Population Census 2011, the municipality has a total population of 42,783.