Purpose: The study aims to reveal the levels of schools as being a PLC regarding the opinions of teachers working at the high schools. Design/Methodology/Approach: The research was carried out in accordance with the correlational survey design. Participants were selected by the stratified sampling method, which is one of the random sampling types. It consists of 385 teachers. The participants of the research are from Maltepe, Sultanbeyli, Esenler and Bakırköy districts of İstanbul during 2021-2022 academic year. To get the data, PLC Scale was used and to analyze descriptive statistics and one-way analysis of variance were used. Findings: The level of being a professional learning community is at the level of "agree". When the scale’s sub-dimensions were examined, a significant difference was found between the employment type, length of service and district variables. On the basis, some suggestions are given to policy makers. Highlights: It is important to establish an online platform that allows the expansion of the learning network. In addition, a framework plan for schools to ensure sustainability is planned. Lastly, the implementation of rotation between schools could be considered to transform individual intelligence into collective intelligence.