According to the 2011 census, the taluk of Radhapuram had a population of 302,268 with 149,056 males and 153,212 females. There were 1028 women for every 1000 men. The taluk had a literacy rate of 79.67. Child population in the age group below 6 was 16,219 Males and 15,620 Females.
- "Provisional Population Totals - Tamil Nadu-Census 2011" (PDF). Census Tamil Nadu. Retrieved 4 July 2013.
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