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This study examined the commuting characteristics and urban spatial structure focusing on self-containment and centrality of the first generation new towns in Korea using the longitudinal household travel survey data of 1996, 2002, 2006, and 2010. We developed nine measures to examine the multi-dimensional concept of self-containment and the interdependency between new towns and surrounding cities. The analysis results show that two new towns such as Ilsan and Jungdong have increased the level of self-containment over time. In contrast, the level of self-containment of Bundang new town is relatively low among five new towns. On the other hand, Bundang new town’s centrality of commuting network is relatively higher than other new towns, indicating that Bundang new town functions as the central place of employment beyond its administrative boundary. In addition, the relationship between the new town and original town in the same administrative boundary indicates that original town’s dependency to newtown has increased over time except Jungdong. Lastly, the dependency of five new towns to the city of Seoul has been decreased over time, indicating the spatial expansion of commuting networks into surrounding local cities from the new towns.