|District||West Champaran district|
|Time zone||IST (UTC+5:30)|
As of 2011 India census, Koirganwan had a population of 1699 in 325 households. Males constitute 50.67% of the population and females 49.32%. Koirganwan has an average literacy rate of 55.79%, lower than the national average of 74%: male literacy is 61.39%, and female literacy is 38.1%. In Koirganwan, 15.5% of the population is under 6 years of age.
- "Census of India 2011". Retrieved 12 March 2014.
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