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GAO-25-107503 [1] (2024-11-07)

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                       U.S. GOVERNMENT ACCOUNTABILITY OFFICE
441 G St. N.W.
Washington, DC  20548

November   7, 2024

The  Honorable Jeanne  Shaheen
Chair
The  Honorable Jerry Moran
Ranking  Member
Subcommittee  on Commerce,   Justice, Science, and Related Agencies
Committee  on Appropriations
United States Senate

The  Honorable Hal Rogers
Chairman
The  Honorable Matt Cartwright
Ranking  Member
Subcommittee  on Commerce,   Justice, Science, and Related Agencies
Committee  on Appropriations
House  of Representatives


Population  Estimates: Results  of the Census  Bureau's Challenge  Program

Between  decennial censuses, the Census  Bureau's Population Estimates Program  (PEP)
annually disseminates population and housing unit estimates for the country at various levels of
geography.' These  annual population estimates are used by state, local, and tribal governments
to allocate federal funds, among other purposes. The Bureau refers to each population estimate
series as a vintage. For example, Vintage 2022 covers April 1, 2020, through July 1, 2022.

The  Population Estimates Challenge Program (PECP)  provides state and local governments the
ability to challenge annual population estimates. The Bureau paused the PECP to support the
2020  Census (as it usually does) and reinstated it in November 2022. The Bureau released the
first set of results from the PECP for Vintage 2022 on February 28, 2024. State or local
governments  (governmental  units) may challenge their population estimate by submitting data
to the Bureau for evaluation or by identifying a technical error in processing input data or in
producing the estimates.

A House  Report that accompanied  the Commerce,  Justice, Science, and Related Agencies
Appropriations Bill 2023 includes a provision for us to review the Census Bureau's efforts and
provide a briefing within 180 days of the Bureau completing its related work on the PECP.2 This


1Annual population estimates are authorized by 13 U.S.C. §181, which requires, to the extent feasible, the production
of current data on total population and population characteristics for each state, county, and local unit of general-
purpose government which has a population of 50,000 or more. The Bureau produces population estimates of the
United States, its states, metropolitan and micropolitan statistical areas, counties, cities, and towns, as well as for the
Commonwealth of Puerto Rico and its municipios. Additionally, the Bureau produces demographic components of
population change (births, deaths, and migration) and housing unit estimates at the national, state, and county levels
of geography.
2Committee on Appropriations, H.R. Rep. No. 117-395, at 19 (2022).


GAO-25-107503  Population Estimates


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