[3] In 2014, the school expanded its campus to include the 9th Grade, which formerly attended a separate building known as the Freshman Academy.

Several sports are offered at MCSHS including: In 2006, the football team won the KHSAA Class 2A State Championship under head coach Marty Jaggers.

Even though the team consisted of two combined squads from the original Mercer County High and Harrodsburg High, the 2006 squad was allowed to compete in Class 2A because it was too late to alter football schedules for that season.

The following year, the Kentucky High School Athletic Association updated Kentucky's 4-class system to a 6-class system, and Mercer County Senior High School was moved to Class 5A to reflect its merger with Harrodsburg High School.

The band won Class AA State Championships in 2005 and 2006 under the direction of Jeffrey Meadows.