Children's Mercy South, conveniently located at I-435 and Nall Ave, in Overland Park, Kan., brings the nationally recognized care of Children's Mercy Hospital to families in the southern part of the Kansas City metropolitan area. All of our services — inpatient care, emergency services, specialty clinics, surgery and support services — are dedicated exclusively to caring for children.. All of our services — inpatient care,emergency services,specialty clinics,surgery and support services — are dedicated exclusively to caring for children.