largest city) Dhaka 23°42′N 90°21′E Official language(s) Bengali (Bangla) Ethnic groups  (1998) 98% Bengali 2% other [1] Demonym Bangladeshi Government Unitary parliamentary democracy [2]  -  President Zillur Rahman  -  Prime Minister Sheikh Hasina  -  Speaker Abdul Hamid  -  Chief Justice Md. Muzammel Hossain Legislature Jatiya Sangsad Independence from Pakistan    -