Hilsa is a Sub-District (Tehsil/Block/Mandal) in the Nalanda District of Bihar. As par Census 2011 information the sub-district code of Hilsa is 01390. There are about 20 sub-districts in Nalanda and Hilsa is one of them. Asthawan, Ben, Bihar, Bind, Chandi, Ekangarsarai, Giriak, Harnaut, Islampur, Karai Parsurai, Katrisarai, Nagar Nausa, Noorsarai, Parbalpur, Rahui, Rajgir, Sarmera, Silao, Tharthari etc. are other sub-districts in Nalanda.There are about 56 villages in Hilsa sub-district, which you can browse from villages list.