Net domestic migration

The difference between domestic in-migration to an area and domestic out-migration from the same area during a specified time period. Domestic in- and out-migration consist of moves where both the origin and the destination are within the United States (excluding Puerto Rico). The net domestic migration rate expresses net domestic migration during a specified time period as a proportion of an area's population at the midpoint of the time period. Rates are expressed per 1,000 population.