CareSource is a leading non-profit managed care company based in Dayton, Ohio. CareSource has grown to be the largest Medicaid managed care plan in Ohio. The company is contracted with the Ohio Department of Job and Family Services. CareSource has 900 employees with 800 in Dayton. CareSource was originally started in Dayton, Ohio in 1985. CareSource was originally called Dayton Area Health Plan or (DAHP) for short. In the year 2000, DAHP consolidated all its health plans under one name – CareSource. In 2004, the organization was ranked sixth-largest Medicaid managed care plan in the United States by Interstudy.  In 2009, The CareSource Management Group completed construction of a $55 million corporate headquarters at the corner of Main Street and Monument Avenue in downtown Dayton. The 300,000-square-foot, 9-story building is downtown's first new office tower since before 2000. The building's Architect was BHDP Architecture. In 2010, CareSource announced expansion of its provider network in Southeastern Ohio through a partnership with Quality Care Partners (QCP), a physician-hospital organization (PHO)