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|• Official||Hindi, Santali|
|Time zone||IST (UTC+5:30)|
As of 2001[update] India census, Sewai had a population of 8,784. Males constitute 53% of the population and females 47%. Sewai has an average literacy rate of 76%, higher than the national average of 59.5%: male literacy is 82%, and female literacy is 68%. In Sewai, 14% of the population is under 6 years of age.
- "Census of India 2001: Data from the 2001 Census, including cities, villages and towns (Provisional)". Census Commission of India. Archived from the original on 2004-06-16. Retrieved 2008-11-01.
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