Obuasi Municipal Assembly was carved out of the erstwhile Adansi West District Assembly on the strength of executive instruments (E. I.) 15 of December, 2003 and Legislative Instrument L. I. 1795 of 17th March, 2007. 

The Municipality is located between latitude 5.35N and 5.65N and longitude 6.35N and 6.90N. It covers a land area of 162.4sqkm.  There are 53 communities in the Municipality which share 30 electoral areas. 

The Municipality is located in the southern part of the Ashanti Region and has a rather undulating topography.  The climate is of the semi-equatorial type with a double rainfall regime. Mean annual rainfall ranges between 125mm and 175mm.  Mean average annual temperature is 25.5OC and relative humidity is 75% - 80% in the wet season.

The population of the Municipality is estimated at 205,000 using the 2000 Housing and Population Census as a base and applying a 4% annual growth rate. 

The vegetation is predominantly a degraded and semi-deciduous forest.  The forest consists of limited species of hard wood which are harvested as lumber.  The Municipality has nice scenery due to the hilly nature of the environment.