Performance is a concept that indicates the importance of work. The purpose of this article is to highlight the influence of socio-demographic characteristics on teachers' job performance. This study is conducted in the pre-university system. In this study, the quantitative method is used and the empirical data were collected using questionnaires. The main findings of the study show that there are no significant differences in the relationship between demographic factors, such as seniority in education and experience in education. There is, however, a meaningful relationship between performance and education level where teachers teach and the area (rural/urban) where they teach. It is suggested that there is a need for more studies, trainings or focus groups, which would help to identify the factors that have an impact on teachers' job performance.