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Margaret B. Henderson Elementary School2200 S. Edgefield AvenueDallas, TX 75224Phone: 972-749-2900 - Fax: 972-749-2901School HoursPK4 - 5th grade 7:45 a.m. - 3:15 p.m.PK3 AM 7:45 a.m. - 11:15 a.m.PK3 PM 11:25 a.m. - 3:15 p.m.Tardy bell: 8:00 a.m.At Margaret B. Henderson Elementary School, our mission is to facilitate student achievement through high expectations and rigorous instruction in a safe and caring environment.