Raniganj is a city and municipality in Araria district of the Indian state of Bihar. It is the headquarter of the Raniganj, Araria Community Development Block. Raniganj is the state assembly constituency. The main language is Hindi. Some residents speak Maithili, Bhojpuri, Urdu, Bengali, or Marwari... Raniganj has the biggest zoo of Bihar (Vriksha Vatika). Raniganj has one government hospital and many private hospitals and clinics.