Garhsisai is a village in Vidyapati Nagar tehsil in district of Samastipur, Bihar, India. As per the data provided by Census of India in 2011, total population of Garhsisai was 12,088 which includes 6,360 males and 5,728 females. Garhsisai covers 631 ha area. Pincode of Garhsisai is N/A.