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EMSA - the Emergency Medical Services Authority - is Oklahoma's largest provider of pre-hospital emergency medical care. We provide ambulance service to more than 1.1 million residents in central and northeast Oklahoma. EMSA was established in Tulsa in 1977 and later expanded to include Bixby, Jenks and Sand Springs. EMSA began providing service to Oklahoma City in 1990. Each year, EMSA responds to more than 110,000 calls for help. We transport more than 70,000 patients by ambulance each year.