Patti Ratan Sar is a village in Chhatapur tehsil in district of Supaul, Bihar, India. As per the data provided by Census of India in 2011, total population of Patti Ratan Sar was 1,675 which includes 887 males and 788 females. Patti Ratan Sar covers 409.9 ha area. Pincode of Patti Ratan Sar is N/A.