Kasya Kalan is a village in Robertsganj tehsil in district of Sonbhadra, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Kasya Kalan was 596 which includes 319 males and 277 females. Kasya Kalan covers 144.39 ha area. Pincode of Kasya Kalan is 231216.