"The caste census was completed long back, but the central government is not releasing the figures under a planned conspiracy. The data should be released immediately. I will march to Raj Bhawan on July 13 to press for it," he said.
Prasad was speaking to reporters at the 19th foundation day celebrations of RJD at its state headquarters here.
He said the march will start from Kargil Chowk and he would go with the supporters to the Raj Bhawan to give a petition demanding release of caste census figures.
The RJD chief's demand gains importance with the Assembly elections just a few months away.
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Prasad, who claims to be leader of the Yadav caste, constitutes around 14 per cent of the 6.5 crore total voters in the state.
Similarly, he claims the support of the minority community, which comprises about 16 per cent of the voters.