As per the 2011 Census, there are 33 tribes in the state of Andhra Pradesh. Among the 33 tribes, 6 tribes namely: Chenchu, Gadaba, Kondh, Konda Reddy, Savara, and Porja are falling under the category of Particularly Vulnerable Tribal Groups (PVTGs). The Chenchu tribe is considered to be the most vulnerable tribal group because of their pre-agricultural state of the economy, and low level of literacy in Andhra Pradesh. The study shows the changing trend of demographic characteristics by using the Census of India data from 1991 to 2011, by using the percentage distribution.