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Today the Census Bureau has released two sets of revised 2009 estimates: 1) July 1, 2009 population estimates for incorporated places and minor civil divisions and 2) July 1, 2009 housing unit estimates for counties. The original estimates were released in June 2010.
These revisions have no effect on any of the previously released Vintage 2009 population estimates at the national, state or county level.
The impact of the revision is relatively small. Of the nation's 35,901 subcounty areas, 5,847 (16 percent) experienced population changes as a result of this revision. Of these areas, 4,377 changed by fewer than 25 people. For the housing unit estimates, the 2009 national total increased by 44,232 units (0.03 percent). *
For the data released in June, some updates from the members of the Federal-State Cooperative for Population Estimates (FSCPE) were not incorporated into the housing unit estimates. The revised estimates now reflect these updates.
These are the last set of estimates for the decade to be based on Census 2000. The 2010 Census results will supersede these estimates.
For more information on these changes, please consult the following explanation: http://www.census.gov/popest/errata.html.
*Correction: text originally read as follows: "or just one-third of one percent (0.03 percent)." This is an error: 0.03 percent is three-hundredths of one percent.