There are five sub-district municipalities (thesaban tambon). Nikhom Songkhro covers parts of tambon Nikhom Songkhro and Khok Sa-at; Nong Bua parts of tambon Nong Bua, Nong Na Kham, Sam Phrao, and Nong Khon Kwang; Ban Chan parts of tambon Ban Chan and Nong Khon Kwang; Na Kha parts of tambon Na Kha.
Nong Samrong covers tambon Na Di and parts of Mu Mon, Ban Lueam, and Non Sung. Nam Kham covers parts of tambon Non Sung.