Pirarthu Kalan is a village in Daraundha tehsil in district of Siwan, Bihar, India. As per the data provided by Census of India in 2011, total population of Pirarthu Kalan was 1,352 which includes 644 males and 708 females. Pirarthu Kalan covers 240 ha area. Pincode of Pirarthu Kalan is N/A.