Bongaigaon is the district headquarters of Bongaigaon District, Assam, India. It has two parts - Old Bongaigaon and New Bongaigaon. Bongaigaon is Pre dominantly and inhibated by the KochRajbongshi Community which is a part of \"Bijni Kingdom\" ruled by Rajbongshi Kings, and Recently it was divided and a new district Chirang was formed, to meet the demands of Bodos of Assam. It has a major petrochemical industry, the Bongaigaon Refinery and Petrochemicals Limited (BRPL).