PURPOSE: The purpose of this study was to suggest the projected workforce of certified emergency nurses in Korea. METHOD: The methods used in this study are 1) demand & ratio model was used for the projected workforce of CEN, 2) Index functional formula was used for the suggestion of the number of general hospitals and hospitals, 3) Experts in Emergency care were contacted to get an opinion and information about the criteria of distribution and scope of CEN, 4) National and international internet data were collected. RESULT: The demand of CEN were analyzed by two ways; demand of Emergency centers only and demand of emergency centers including community centers. The number of CENs needed to meet the demands in 2002, 2005 and 2010 was estimated at minimum of 1,512 to maximum1,576, 1,640 to 1,704 and 1,892 to 1,956 respectively. The projected number of CENs for the 2002 was 1% total available nurses in Korea, and 3.2 CENs per 100,000 population. CONCLUSION: It is really desirable that CENs not only work for hospital emergency centers but also for emergency related centers in community.