Rajnagar is a Sub-District (Tehsil/Block/Mandal) in the Madhubani District of Bihar. As par Census 2011 information the sub-district code of Rajnagar is 01095. There are about 21 sub-districts in Madhubani and Rajnagar is one of them. Andhratharhi, Babubarhi, Basopatti, Benipatti, Bisfi, Ghoghardiha, Harlakhi, Jainagar, Jhanjharpur, Kaluahi, Khajauli, Ladania, Lakhnaur, Laukaha, Laukahi, Madhepur, Madhubani, Madhwapur, Pandaul, Phulparas etc. are other sub-districts in Madhubani.There are about 61 villages in Rajnagar sub-district, which you can browse from villages list.