The district was established in 1897 named Ko Chang district. The district office was located in Ban Dan Kao on Ko Chang. The district controlled all islands in Trat province. As the district office was located on an island, it was not convenient for most of people on mainland, thus the government moved the office to Ban Laem Ngop but still keep the district name. Later in 1939 the district name was changed according to the location of district office.[1]