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              Congressional
           *.Research Service





Apportionment and Redistricting Following

the 2020 Census



Updated March 17, 2021
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. 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 with
relatively equal-sized populations for each House district.
Timelines for the census and apportionment are provided in federal statute and generally occur as
scheduled every decade. The Coronavirus Disease 2019 (COVID-19) pandemic, however, affected 2020
census field operations and delivery of apportionment figures; concerns remain about timing for the
apportionment and redistricting processes that follow the completion of the census. This Insight provides
background on the typical timing of the census, apportionment, and redistricting, as well as a brief
discussion of recent 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 typical census, apportionment, and redistricting processes. Federal
statute requires that April 1 of any year ending in 0 marks the official decennial census date. Acount
known  as the apportionment population, which reflects the total resident population in each state, is
typically 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 is to report the apportionment population to the
President; the Census Bureau has often released apportionment counts publicly at about the same time.
According to this timeline, within the first week of the first regular session of the next Congress, the
President transmits a statement to Congress with information on how to apportion House seats. The
President's message contains the apportionment population and resulting number of Representatives for
each state, based on the total number of Representatives (435) and using the method of equal proportions.

                                                              Congressional Research Service
                                                                https://crsreports.congress.gov
                                                                                   IN11360

CRS INSIGHT
Prepared for Membersand
Committeesof Congress

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