Following a decision of the Thai government on May 15, 2007, all of the 81 minor districts were to be upgraded to full districts. With the publishing in the Royal Gazette on August 24 the upgrade became official.
The district is subdivided into 2 subdistricts (tambon), which are further subdivided into 27 villages (muban). Ko Chan and Tha Bunmi are both subdistrict municipalities (thesaban tambon) which each cover parts of the same-named tambon. There are further 2 Tambon administrative organizations (TAO).