When there are more people dying than babies being born, this is known as “natural decrease.”
In fact, estimates released today by the U.S. Census Bureau reveal that 58.0% of counties experienced population growth, often because of net domestic migration, which means in many instances enough people moved into counties to offset natural decrease.
Population changes for a given county result from a combination of natural change (the difference between births and deaths) as well as international and domestic migration.
The net domestic migration for a given geographic area is the difference between in-migration (the number of people moving in) and outmigration (the number of people moving out) during a migration period. We typically measure migration from July 1 of one year through June 30 of the next (e.g., July 1, 2020, to June 30, 2021, represents the 2020-2021 migration period).
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