[4] The district headquarters and all other administrative offices are located here.

As of the 2011 Census of Bangladesh, Feni Sadar had 97,869 households and a population of 512,646.

[8] Feni Sadar Upazila is divided into Feni Municipality and 12 union parishads: Baligaon, Chonua, Dholia, Dhormapur, Fazilpur, Forhadnogor, Kalidah, Kazirbag, Lemua, Motobi, Panchgachia, and Sarishadi.

The union parishads are subdivided into 134 mauzas and 125 villages.

[9] Feni Municipality is subdivided into 18 wards and 35 mahallas.