Currently, the Town of Black Diamond is located in the Provincial riding known as Highwood. The Member of the Legislative Assembly (MLA) for the constituency is Mr. R.J. Sigurdson. Contact information for Mr. Sigurdson can found on the province of Alberta Legislative Assembly website. 

The Electoral Map of Alberta was re-drawn for the 2019 Provincial Election, and the Town of  Diamond Valley is now located in the riding of HIGHWOOD.  

Electoral maps for all Alberta constituencies can be found on the Elections Alberta website.