Harpur Kalan is a village in Biraul tehsil in district of Darbhanga, Bihar, India. As per the data provided by Census of India in 2011, total population of Harpur Kalan was 5,150 which includes 2,711 males and 2,439 females. Harpur Kalan covers 333 ha area. Pincode of Harpur Kalan is N/A.