This study aims to analyze the concentration ratios of bulk ports to reveal geographical
patterns, using the case of bulk ports along the west coast of Korea including, Incheon Port (ICP), Pyeongtaek-Dangjin Port (PDP), and Gunsan Port (GSP). To examine and shed more light to the above mentioned research issue, this paper adopts a series of methods, such as Hirshmann-Herfindahl Index (HHI), Location Quotients (LQ), and Shift Effects (SE) Results from the HHI analysis, indicated that de-concentration has been gradually rising because of a considerable overlapping of ports’ functions. Meanwhile, the LQs’ confirmed this result. Finally, the SE’ results effectively showed that a substantial shifting of cargo had occurred among the ports.