This graphic shows the 10 largest state-to-state migration flows in and out of California for the period 1955-1960 compared to that of 1995-2000. In the late 1950s, the largest flows involving California were all inflows to the state, generally from states in the Midwest or Northeast. This pattern contrasted with the flows in the late 1990s, where nearly all of the largest migration streams involving California represented out-migration to other states.
Census 2000 and 1960 Census Subject Reports, Migration Between State Economic Areas, Final Report PC(2)-2E, Washington, DC, 1967.