The Wenchi Municipal Assembly was one of the two local authorities created in 1974 to oversee the then Nkoranza, Techiman, Yeji, Attebubu and Kintampo in the Brong Ahafo region.
The Decentralization reforms of 1988 established it as a district by Legislative Instrument 1471 of 1989. In 2004, with the creation of Tain District, the Assembly operated under Legislative Instrument 1782 of 2004.
The district was later upgraded to a municipality status by Legislative Instrument 1876 of 2007.
The Wenchi Municipality is located in the western part of Brong-Ahafo Region and lies within latitudes 7°30’ and 8°05’ North and longitudes 2o 15’ West and 1o 55’ East.
It covers a total land area of 1,145 square kilometers and shares boundaries with Techiman Municipal to the west, Kintampo South District to the northwest, Tain District to the east and Sunyani Municipal to the south.
Wenchi, the Municipal capital, is 29 km from Techiman which is arguably the commercial town (largest market in the region) of the Brong Ahafo Region.
The population of the Municipality according to the 2010 Polulation and Housing Census stands at 89,739 with 44,065 males and 45,674 females.