|Elevation||77 m (253 ft)|
|• Official||Maithili, Hindi|
|Time zone||UTC+5:30 (IST)|
|Telephone code||+91 6246|
|ISO 3166 code||IN-BR|
|Lok Sabha constituency||Jhanjharpur|
|Vidhan Sabha constituency||Khajauli|
Jainagar (also spelled as Jaynagar) is a town and a notified area of Madhubani district in Bihar, India. It is situated on the holy Kamala River and has road and rail connections to Bihar's main cities like Patna and also to neighbouring country Nepal. The Jainagar is well connected to Janakpur province of Nepal by a narrow gauge rail line but from 2014 the Indian government decided to convert that line into braod gauge rail line so the steering of trains were stopped . Jainagar is situated in the centre of Mithilanchal so here the Mithilanchal culture is found very easily.
As of 2011[update] India census, Jainagar had a population of 1,77,556. Males constitute 53% of the population and females 47%. Jainagar has an average literacy rate of 58%, slightly below the national average of 74.04%. Male literacy is 98%, and female literacy is 88%. 16% of the population is under 6 years of age.