|• Official||Bhojpuri, Hindi|
|Time zone||UTC+5:30 (IST)|
|ISO 3166 code||IN-BR|
Koilwar is located at . It has an average elevation of 39 metres (128 ft). It is situated on the bank of Son River.
Koilwar Bridge 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 1862. 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.
A famous Shiv Temple is the moonlight of the village. On every 14th of January and on the eve of Mahashivratri a fair takes place near the temple.
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.
- "Koelwar, India Page". Bihar. Falling Rain Genomics. Retrieved 10 March 2009.
- "Census of India 2001: Data from the 2001 Census, including cities, villages and towns (Provisional)". Census Commission of India. Archived from the original on 16 June 2004. Retrieved 1 November 2008.
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