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These external sites provide more data.
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The Census Bureau's Director writes on how we measure America's people, places and economy.
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Intercensal estimates are produced each decade by adjusting the existing time series of postcensal estimates for a decade to smooth the transition from one decennial census count to the next. They differ from the postcensal estimates that are released annually because they rely on a formula that redistributes the difference between the April 1 postcensal estimate and April 1 census count for the end of the decade across the estimates for that decade. Meanwhile, the postcensal estimates incorporate current data on births, deaths, and migration to produce each new vintage of estimates, and to revise estimates for years back to the last census.
The 2000-2010 Intercensal Estimates may undergo revisions and be re-released at a later point in the decade.