Kochas is a Sub-District (Tehsil/Block/Mandal) in the Rohtas District of Bihar. As par Census 2011 information the sub-district code of Kochas is 01457. There are about 19 sub-districts in Rohtas and Kochas is one of them. Akorhi Gola, Bikramganj, Chenari, Dawath, Dehri, Dinara, Karakat, Kargahar, Nasriganj, Nauhatta, Nokha, Rajpur, Rohtas, Sanjhauli, Sasaram, Sheosagar, Suryapura, Tilouthu etc. are other sub-districts in Rohtas.There are about 182 villages in Kochas sub-district, which you can browse from villages list.