Kachaur is a village in Sonbarsa tehsil in district of Sitamarhi, Bihar, India. As per the data provided by Census of India in 2011, total population of Kachaur was 5,978 which includes 3,142 males and 2,836 females. Kachaur covers 196 ha area. Pincode of Kachaur is 843317.