Jankopai is a village in Bandgaon tehsil in district of Pashchimi Singhbhum, Jharkhand, India. As per the data provided by Census of India in 2011, total population of Jankopai was 437 which includes 214 males and 223 females. Jankopai covers 106 ha area. Pincode of Jankopai is 835216.