The Jomoro Municipal is one of the 261 Metropolitan, Municipal and District Assemblies (MMDAs) in Ghana and forms part of the 14 MMDAs in the Western Region.

Jomoro Municipal, which used to be part of the then Nzema East Municipal was created by Legislative Instrument 1394 in 1988 with the administrative capital of the Municipality as Half Assini.

The Jomoro Municipal is located in the southwestern corner of the Western Region of Ghana and covers a total land area of 1,495 square kilometres.

It is bounded on the south by Latitude 4, 80 N and the Atlantic Ocean {Gulf of Guinea}. It is bounded in the north by Latitude 5, 21 N and the Nini River. It also lies between Longitude 2, 35 W to the East and 3, 07 W to the West.

The Municipality shares boundaries with Amenfi West Municipal and Aowin Municipal to the north, Nzema East Municipal to the east and La Côte D’Ivoire to the west and the Gulf of Guinea to the south.

The population of the Municipality according to 2021 population and housing census stands at 126,576 with 62,649 males and 63,927 females.