Using yearly estimates of US. interstate migration and state-level capital stocks we explore the relationships between migration and capital in a time-series framework for the period 1958-1975. The analysis shows that capital growth leads in-migration for fast-growing states, although no obvious relationship is apparent for some rapidly growing areas. However, for slow-growth states the relationships are more complex and interwoven. Box-Jenkins techniques and tests of causality are utilized to describe the temporal structure of migration and capital. Finally, we offer suggestions toward reconceptualizing the labor market relations implicit in regional economic growth and, in particular, labor migration.