You can apply for an Ontario birth or death certificate from ServiceOntario by mail or online.
For more information please contact the Office of the Registrar General toll free at 1-800-461-2156, or within the GTA area at 416-325-8305.
You can get the application form from the ServiceOntario website. Then mail the completed form to:
ServiceOntario
Office of the Registrar General
P.O. Box 4600,
189 Red River Road
Thunder Bay, Ontario
P7B 6L8