Kastdhir Rai is a village in Ghosi tehsil in district of Mau, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Kastdhir Rai was 87 which includes 47 males and 40 females. Kastdhir Rai covers 11.91 ha area. Pincode of Kastdhir Rai is 275303.