Khadak Municipality is located in Saptari District in the Province 2 of Nepal. It was formed in 2016 occupying current 11 sections (wards) merging previous Siswa Belhi, Banarjhula, Pansera, Khojpur, Kalyanpur, Fulbariya, Mainasarsabahu and Banauli VDCs, residing its head office at Kalyanpur Bazaar. It occupies an area of 96.77 km2 with a total population of 45,367.