The minor district (king amphoe) Prang Ku was established on 1 January 1961, when it was split off from Khukhan district. The district is named after Prang Samong in Ban Ku. On 17 July 1963 it was upgraded to a full district.
Administration
The district is divided into 10 sub-districts (tambons), which are further subdivided into 141 villages (mubans). Prang Ku is a township (thesaban tambon) which covers parts of tambon Phimai and Phimai Nuea. There are a further 10 tambon administrative organizations (TAO).