Semarhava is a village in Nautanwa tehsil in district of Mahrajganj, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Semarhava was 2,314 which includes 1,215 males and 1,099 females. Semarhava covers 292.65 ha area. Pincode of Semarhava is 273164.