Muslim traders and preachers from the then Islamic worlds had been settling in Chandanaish due to the close proximity of Chandanaish from the river Karnaphuli.

However, the Muslim settlement was permanently established when the medieval Islamic invasion occurred in Chittagong.

As of the 2011 Census of Bangladesh, Chandanaish upazila had 44,438 households and a population of 233,017.

[8] Chandanaish Upazila is divided into Chandanaish Municipality, Dohazari Municipality, and nine union parishads: Bailtali, Barama, Barkal, Dhopachhari, Dohazari, Hashimpur, Joara, Kanchanabad, and Satbaria.

[11] The main communication road in Chandanish Upazila is Chittagong-Cox's Bazar highway.

This upazila can be contacted over Barkal Bridge of Chittagong-Anwara District.