Rajam was ruled by the great King Raja tandra Paapa rayudu of Andhra Padamanayaka clan,He was a great warrior. He killed Vijayaramaraja Gajapaty of vizayanagaram during the bobbili war because of his cheating and mingle with french governor bussy to occupy the Sarkars(north Andhra). Later it was ruled by the veera bobbili kings.It is very near to the famous Vavilavasa Zamindari ruled by Rajha Inuganty Venkatarayudu
As of 2011[update] India census, Rajam had a population of 443532. Males constitute 51% of the population and females 49%. Rajam has an average literacy rate of 66%, higher than the national average of 59.5%: male literacy is 75%, and female literacy is 58%. In Rajam, 11% of the population is under 6 years of age.