Population mobility

Geographic mobility is the measure of how populations move over time. Geographic mobility, population mobility, or more simply mobility is also a statistic that measures migration within a population. Commonly used in demography and human geography, it may also be used to describe the movement of animals between populations. These moves can be as large scale as international migrations or as small as regional commuting arrangements. Geographic mobility has a large impact on many sociological factors in a community and is a current topic of academic research. It varies between different regions depending on both formal policies and established social norms, and has different effects and responses in different societies. Population mobility has implications ranging from administrative changes in government and impacts on local economic growth to housing markets and demand for regional services.

Geographic mobility data is available from census and public government records in the United States, the European Union, China and many other countries.

Mobility estimates in the Current Population Survey (CPS), produced by the United States Census Bureau, define mobility status on the basis of a comparison between the place of residence of each individual to the time of the March survey and the place of residence one year earlier. Non-movers are all people who were living in the same house at the end of the migration period and the beginning of the migration period. Movers are all people who were living in a different house at the end of the period rather than at the beginning. They are further classified as to whether they were living in the same or different county, state, region, or were movers from abroad. Movers are also categorized by whether they moved within or between central cities, suburbs, and non-metropolitan areas of the United States.

The CPS includes information on reasons for a move. These include work-related factors, such as a job transfer, job loss or looking for work, and wanting to be closer to work. Housing factors include wanting to own a home, rather than rent, seeking a better home or better neighborhood, or wanting cheaper housing. Additional mobility factors include attending college, changes in marital status, retirement, or health-related moves.

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