|• Official||Bhojpuri, Hindi|
|Time zone||IST (UTC+5:30)|
Koilwar is located at . It has an average elevation of 39 metres (128 ft).
Koilwar is situated on the River Sone; its steel rail road bridge called as Abdul Bari Bridge, made before independence, is shown in the film Gandhi. The Koelwar bridge across the Sone river was built by the British in 1900. A two lane road (NH 30) runs just under the rail tracks. Sand mining near the pillars of this old bridge has created structural problems recently.
In the 2001 India census, Koilwar had a population of 19,925. Males constitute 61% of the population and females 39%. Koilwar has an average literacy rate of 55%, lower than the national average of 59.5%. Male literacy is 55%, female literacy 54%. 19% of the population is under 6 years of age.
The village has a renowned TB hospital & Mental hospital
- "Koelwar, India Page". Bihar. Falling Rain Genomics. Retrieved 2009-03-10.
- "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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