Harnath Patti is a village in Phulparas tehsil in district of Madhubani, Bihar, India. As per the data provided by Census of India in 2011, total population of Harnath Patti was 584 which includes 300 males and 284 females. Harnath Patti covers 145.3 ha area. Pincode of Harnath Patti is N/A.