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 population of the Municipality according to the 2010 Population and Housing Census stands at 168,641 with 81,015 males 87,626 females.