The Klang Valley Network Revamp was established in 2015 by Suruhanjaya Pengangkutan Awan Darat (SPAD) to improve the public transportation service quality in the Klang Valley. Upgrading the quality of bus services is one of the government’s initiatives to improve public transportation in urban areas. This study aimed to evaluate the passenger load factor of the public bus service in three different areas of the Klang Valley. Three routes, each at five different areas in the west side of Klang Valley were selected, which covered Klang, Shah Alam, Puchong, Kelana Jaya, and Petaling Jaya, in order to identify the total passenger load at these selected areas. The results showed that most of the routes have the Quality of Service (QOS) A, and there were several aspects that should be improvised, such as the waiting time during peak hours and the various destinations in the area of service.