Thummalabylu is a village in Gandlapenta tehsil in district of Anantapur, Andhra Pradesh, India. As per the data provided by Census of India in 2011, total population of Thummalabylu was 980 which includes 521 males and 459 females. Thummalabylu covers 792 ha area. Pincode of Thummalabylu is 515521.