| American Community Survey: 5-Year Migration Flows | Migration flows are derived from the relationship between the location of current residence in the American Community Survey (ACS) sample and the responses given to the migration question "Where did you live 1 year ago?". There are flow statistics between state or world region of residence 1 year ago and current county of residence. In addition to the flow estimates, there are supplemental statistics files that contain migration/geographical mobility estimates (e.g. nonmovers, moved to a different state, moved from abroad) for each current residence county. | 2021 | acs› flows | Aggregate | geographies | variables | groups | sorts | examples | documentation | http://api.census.gov/data/2021/acs/flows |