Derajsar is a village in Sridungargarh tehsil in district of Bikaner, Rajasthan, India. As per the data provided by Census of India in 2011, total population of Derajsar was 3,858 which includes 2,004 males and 1,854 females. Derajsar covers 2953 ha area. Pincode of Derajsar is 331811.