Bongaigaon is a major city in the Indian state of Assam. Its urban area spans across Bongaigaon and Chirang district. The city also serves as the gateway of the North-East Frontier Railway Zone with its New Bongaigaon Junction railway station, the second biggest railway station in North-East India. It also acts as the district headquarters of Bongaigaon district and commercial and industrial hub of the west part of the state of Assam. Bongaigaon is one of the most populated urban agglomerations in Assam, alongside Guwahati, Jorhat, Dibrugarh and Silchar.