Silao is a Sub-District (Tehsil/Block/Mandal) in the Nalanda District of Bihar. As par Census 2011 information the sub-district code of Silao is 01395. There are about 20 sub-districts in Nalanda and Silao is one of them. Asthawan, Ben, Bihar, Bind, Chandi, Ekangarsarai, Giriak, Harnaut, Hilsa, Islampur, Karai Parsurai, Katrisarai, Nagar Nausa, Noorsarai, Parbalpur, Rahui, Rajgir, Sarmera, Tharthari etc. are other sub-districts in Nalanda.There are about 49 villages in Silao sub-district, which you can browse from villages list.