The minor district (King Amphoe) was established on April 19, 1929 as a subordinate of Hot district, consisting of the three subdistricts Omkoi, Yang Piang and Mae Tun. It was upgraded to a full district on July 23, 1958.
Administration
The district is subdivided into six subdistricts (tambon), which are further subdivided into 95 villages (muban). Omkoi is a subdistrict municipality (thesaban tambon) which covers parts of the tambon Omkoi. There are further six tambon administrative organizations (TAO).
Gallery
Road 1099 eventually ends in the jungle at Mae Thun Noi, Amphoe Omkoi
Road 1099 eventually ends in the jungle at Mae Thun Noi, Amphoe Omkoi