The American Community Survey (ACS) and the Puerto Rico Community Survey (PRCS) ask respondents age 1 year and over whether they lived in the same residence 1 year ago. For people who lived in a different residence, the location of their previous residence is collected. The state-to-state migration flows are created from tabulations of the current state (including the District of Columbia and Puerto Rico) of residence crossed by state of residence 1 year ago. Tables of ACS state-to-state flows are available going back to the 2005 ACS – the first year of full implementation of the survey. People living in group quarters (e.g. adult correctional facilities, nursing facilities, college/university student housing, and military quarters) were added to the sample for the first time starting with the 2006 ACS.
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