Semarahna is a village in Naugarh tehsil in district of Siddharthnagar, Uttar Pradesh, India. As per the data provided by Census of India in 2011, total population of Semarahna was 3,687 which includes 1,896 males and 1,791 females. Semarahna covers 386.04 ha area. Pincode of Semarahna is N/A.