Although numerous efforts have been made to investigate the various causes for spatial segregation, existing studies have tended to overlook home-work relationships, which may influence the (un)changed features of segregation. This study considers the persistence of Korean residential concentration in Osaka, Japan, with data obtained from land registration and directories of Korean businesses, and clarifies the effects stemming from non-movers and the home-work relationships of Koreans. It confirms that Koreans began to purchase the land on which they lived after the 1960s, and that this process seems to have resulted in a decrease in their residential mobility. At the same time, non-resident Koreans, who tended to live within ethnic concentrations, also obtained land therein. Moreover, information about mortgages indicates that a significant number of Korean landowners, whether residents or non-residents, were entrepreneurs and that the lands they held operated as a source of funds. However, the same information reveals that Koreans also frequently resorted to using Japanese financial institutions. Thus, it is worth noting that the persistence of ethnic concentration is not always linked with the apparent existence of ethnic-related resources.