Patilar is located in
West Champaran District of
Bihar. It is 42 km north-west of
Bettiah. Patilar is perched at an altitude of 223 ft above sea level and lies on the eastern bank of Gantak River. The town is prone to flood during the monsoons.
Patna Airport and Varanasi Airport are the closest airports. Patilar is served by Bagaha Railway Station and is 15 km south of Bagaha.