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Historically, there are a small percentage of cases where a wrong geographic boundary or coding of a housing unit was used to produce the official census population and housing counts for a local area. Geocoding errors can occur when a living quarter such as a house, apartment, or military vessel, is placed in an incorrect location. There may also be processing errors.
The Census Bureau works with tribal, state, and local governments to help ensure a complete and accurate count during each census. Elected officials may request a review of their jurisdiction’s census counts. During the review process, the Census Bureau will not collect any additional data. If a review results in a change, the bureau issues official revised counts to the affected government. All data, geography, and technical documentation notes and errata are published.
Download corrected 2020 Census counts by state. The U.S. Census Bureau will use the corrected counts in the baseline used to calculate its annual population estimates. Tables are available that show original and corrected counts for geographies where there was a change in population or housing unit totals. State (ST) tables are available only for states where there was a Count Question Resolution (CQR) change at the state level. Governmental unit (GU) tables are available only for states where there was a CQR change at the governmental unit level. Tract and block (TB) tables are available for all states affected by CQR.
For the 2020 CQR program, the Census Bureau received 123 total inquiries and accepted 104 of those as cases for research. After review, there were 2 states with a change at the state level; 21 states with a change at the governmental unit level; and 30 states with a change at the tract and block level. Overall, a total of 148 governmental units in the United States were affected by CQR. There was no change in totals for the United States, District of Columbia, Puerto Rico, American Indian Areas, Alaska Native Areas, and Hawaiian Home Lands.
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