Gajgaon is a village in Gangapur tehsil in district of Aurangabad, Bihar, India. As per the data provided by Census of India in 2011, total population of Gajgaon was 2,565 which includes 1,315 males and 1,250 females. Gajgaon covers 835 ha area. Pincode of Gajgaon is 423702.