Introduction: In order to strengthen the core competencies of workers, systematic education tailored to their needs is necessary. In this study, a survey was conducted on workers in public health care service in Ulsan Metropolitan City (Ulsan) to investigate the demand for education according to core competencies.Methods: A total of 70 workers who work for public health care service in Ulsan participated in this online survey. The questionnaire consisted of socio-demographic factors, work ability, education demand, and preference of education form.Results: The core competency with a high level of work ability is ‘Expertise on health and disease’ (41, 58.6%). On the other hand, the core competency with a low level of work ability was found to be the ‘Evaluation-related theories of public health care service’ (57, 81.4%). The core competencies with the highest demand for education were “Resident-centered service implementation” and “Public health care service strategy development” (64, 91.4%), followed by ‘Public health care service cases review’ and ‘knowledge of public health service plan’ (63, 90.0%). The preferred form of education is offline education (49, 40.8%). The most important factor in education was ‘work utilization’ (Offline: 57, 81.4%; Online: 48, 68.6%), both online and offline.Conclusions: Through the research results, it was possible to find out education demand according to core competencies and preference of education form. Based on these results, we will develop a core competency education program tailored to actual demand. In the future, it is necessary to continuously conduct research on such education demand.