Grand Prairie Services (GPS) is a not-for-profit integrated healthcare provider with over 73 years of experience providing outpatient counseling, mental health services and primary care. The organization began in 1950 as a counseling agency in Park Forest, and then merged in 1956 with social service groups representing Park Forest, Chicago Heights, Homewood and Harvey.

Over the past years and continuing today, the organization has responded to its primary service area by offering a comprehensive continuum of professional behavioral healthcare services to children, adolescents, adults and seniors living in the thirty-two municipalities of Bloom, Bremen, Rich and Thornton townships.