Jankosasan is a village in Khuntpani tehsil in district of Pashchimi Singhbhum, Jharkhand, India. As per the data provided by Census of India in 2011, total population of Jankosasan was 579 which includes 290 males and 289 females. Jankosasan covers 297 ha area. Pincode of Jankosasan is 833201.