The Effia Kwesimintsim Municipal is one of the 261 Metropolitan, Municipal and District Assemblies (MMDAs) in Ghana and forms part of the14 MMDAs in the Western Region.

The Effia Kwesimintsim Municipal Assembly is carved out of the Takoradi Metropolitan Assembly as one of the 38 newly created and upgraded District Assemblies in 2018.

Created with Legislative Instrument (L.I) 2349 the Effia Kwesimintsim Municipal Assembly has its capital as  Kwesimintsim.

It was inaugurated on March 15, 2018 alongside other 37 newly created districts.  

The Municipality occupies land area of 54.44 Square Kilometers, which represent about 0.25% of the total land size of the Western Region

It shares boundaries with Ahanta West District to the west, Sekondi Takoradi Metropolitan Assembly to the south and east and Mpohor District Assembly to the north.

The population of the Municipality according to 2021 population and housing census stands at 173,975

with 85,864 males and 88,111 females.