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This paper analyzes the productivity of information technology in emergency response systems. "Enhanced 911" (E911) is information technology that links caller identification to a location database and so speeds up emergency response. We assess the impact of E911 on health outcomes using Pennsylvania ambulance and hospital records between 1994 and 1996, a period of substantial adoption. We find that, as a result of E911 adoption, patient health measured at the time of ambulance arrival improves, suggesting that E911 enhances the timeliness of emergency response. Further analysis using hospital discharge data shows that E911 reduces mortality and hospital costs.