The body with its head smashed by a stone was found in a paddy field behind a school in Kamdara police station this evening, sources said.
The father of the girl registered a complaint with the police yesterday after she did not return home since Friday, the police said.
The residents blockaded Simdega-Ranchi route from 5 pm in protest against the atrocious killing.
The incident comes close on the heels of the police recovering two minor girls in Jamtara and one in Ranchi district a few days ago, and the police had said they were rape and murder cases.