Semari Ban Casya is a village in Domariyaganj tehsil in district of Siddharthnagar, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Semari Ban Casya was 907 which includes 462 males and 445 females. Semari Ban Casya covers 91.37 ha area. Pincode of Semari Ban Casya is N/A.