|Boundary as of 2012|
When the sanitary district of Pa Ko Dam was created in 1992 [Gazette], it covered the most densely populated area around Phayon Yothin highway, not taking care of the subdistrict boundaries. Thus the sanitary district did cover parts of the subdistrict Pa Ko Dam as well as smaller parts of Chom Mok Kaeo. Later in the 1990s, decentralization became the new policy, turning the sanitary district into a subdistrict municipality in 1999, and creating the TAO Pa Ko Dam in 1996. This additional local government unit thus covered the remaining area of the subdistrict - which is cut into two halves by the municipality.
|Boundary as of 1992|