| Village | Koilahara |
| Block | Madhuban |
| District | Purbi Champaran |
| State | Bihar |
| Country | India |
| Continent | Asia |
| Time Zone | IST ( UTC + 05:30) |
| Currency | Indian Rupee ( INR ) |
| Dialing Code | +91 |
| Date format | dd/mm/yyyy |
| Driving side | left |
| Internet cTLD | in |
| Language | Hindi,Urdu |
| Time difference | -11 minutes |
| Latitude | 25.62 |
| Longitude | 85.13 |
Koilahara is a village panchayat located in the Purbi Champaran district of Bihar state,India. The latitude 25.62 and longitude 85.13 are the geocoordinate of the Koilahara.
The surrounding nearby villages and its distance from Koilahara are Bajit Par , Bhalwa , Dulma , Garahia , Karis Nagra , Koria Kajraha , Madhuban , Madhuban North , Madhuban South , Nawrangia Madhopur , Rupni , Sawagia , Talimpur .
The native language of Koilahara is Hindi,Urdu and most of the village people speak Hindi,Urdu. Koilahara people use Hindi,Urdu language for communication.
Koilahara village is located in the UTC 5.30 time zone and it follows indian standard time(IST). Koilahara sun rise time varies -11 minutes from IST. The vehicle driving side in Koilahara is left, all vehicles should take left side during driving. Koilahara people are using its national currency which is Indian Rupee and its internationl currency code is INR. Koilahara phones and mobiles can be accesed by adding the indian country dialing code +91 from abroad. Koilahara people are following the dd/mm/yyyy date format in day-to-day life. Koilahara domain name extension( cTLD) is .in .