Lawrence, MA 01843. Main Line (978) 722-8391. GLFHC at Greater Lawrence Technical School. GLFHC at Greater Lawrence Technical School. 57 River Road. Andover, MA 01810. Main Line (978) 686-8521. For more information on our School-Based Health Centers, click here. *Urgent/Acute Care extended hours available after 5 PM and on weekends & holidays..