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              Congressional
              Research Servkc





Apportionment and Redistricting Following

the 2020 Census



Updated December 9, 2020
The census, apportionment, and congressional redistricting are interrelated processes that occur every
decade. The U.S. Constitution provides that a decennial census determines the distribution of U.S. House
seats across states, though the federal government today also uses census data for other purposes, such as
distributing funding to states and localities. The process of dividing House seats across states is known as
apportionment (or reapportionment). Each state must receive one House seat and additional seats are
distributed proportionally based on state population size. States then engage in redistricting, creating or
redrawing geographic subdivisions for each House district with relatively equal-sized populations.
Timelines for the census and apportionment are provided in federal statute and generally occur as
scheduled every decade. The COVID-19 pandemic, however, affected 2020 census field operations, and
raised concerns about timing for the apportionment and redistricting processes that follow the completion
of the census. This Insight provides background on the typicaltiming of the census, apportionment, and
redistricting, as well as a brief discussion of recent 2020 census operational changes and proposals,
particularly those related to the subsequent congressional apportionment and redistricting.


Typical Timing -Census, Apportionment, and

Redistricting

Figure 1 illustrates a timeline of the typic al census, apportionment, and redistricting processes. Federal
statute requires that April 1 of any year ending in 0 marks the official decennial census date, although
the Census Bureau begins certain population counts and outreach earlier. Acount known as the
appo  ijonnent population, which reflects the total resident population in each state (including minors and
noncitizens, in addition to Armed Forces and federal civilian personnel and their dependents living
abroad), is typic ally used to distribute House seats. Within nine months of the decennial census date
(December 31 of the year ending in 0), the Secretary of Commerce reports the apportionment
population to the President. The Census Bureau has, in past years, released apportionment counts publicly
at about the same time.



                                                              Congressional Research Service
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