The Network Structure of Job-to-Job Mobility (March 2007) Abstract: This paper uses tools of complex network analysis to characterize a novel representation of the labor market called the realized mobility network (Abowd, Creecy and Kramarz, 2002). The realized mobility network links each worker in a sample to every job he has held. I find this network has topological properties consistent with random movements of workers between employers, but also with non-random selection of workers by firms. Furthermore, partitioning the realized mobility network into densely connected subgroups produces results that are consistent with more common methods of labor market analysis. In particular, workers with similar demographic characteristics and incomes are more likely to have closely related work histories. While far from conclusive, the results indicate that these methods may have application to the discovery of local labor market areas and occupational mobility analysis when applied to matched employer-employee data.