Khamhia is a village in Mainatanr tehsil in district of Pashchim Champaran, Bihar, India. As per the data provided by Census of India in 2011, total population of Khamhia was 3,707 which includes 1,939 males and 1,768 females. Khamhia covers 257.06 ha area. Pincode of Khamhia is 845306.