Population estimates give the best available measure of the size and composition of the population usually living in an area. Estimates are derived from the latest census data with adjustments for net census undercount, residents temporarily overseas on census night, and births, deaths, and migration since the census.
Population projections give an indication of the future size and composition of the population. Multiple projection series are produced using different combinations of assumptions about future fertility (births), mortality (deaths), and migration.
Population estimates are for dates in the past, whereas projections are for dates in the future.
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