Harnatha is a village in Pakri Dayal tehsil in district of Purba Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Harnatha was 7,286 which includes 3,781 males and 3,505 females. Harnatha covers 456.1 ha area. Pincode of Harnatha is 845418.