The public transportation system is critical in meeting the demands of the rapidly growing population and increased mobility. Thus, providing and improving public services has become an urgent need in recent years. This study aims to evaluate the level of Baghdad's public transport system using a variety of criteria, including public transport availability, and comfort level. Service level is a method used to develop transport infrastructure labels based on a specific analysis. The importance of evaluating road operational performance services to improve bus service delivery is based on the concept of service level. The relatively high performance of bus service delivery can affect the level of satisfaction of its users. The availability of public transportation is analyzed in terms of frequency, service coverage, and hours. This study assesses the level of service for five specific major bus routes in Baghdad (4, 12, 45, 61, and 113). Survey processes were used to collect data. The results indicate that all lines according to service hours were at the level of service "E". While the service frequency is within the service levels "A", "B", and "C", and transit-auto travel time is within the service levels Class "B", and "C". This study contributes to being a useful guide for developing a comprehensive plan for the level of service and improving the quality of bus service.