Lagunaha is a village in Bagaha tehsil in district of Pashchim Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Lagunaha was 7,681 which includes 4,008 males and 3,673 females. Lagunaha covers 566.2 ha area. Pincode of Lagunaha is N/A.