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Apportionment and Redistricting Following

the 2020 Census



April 24, 2020
The census, apportionment, and congressional redistricting are interrelated processes that occur every
decade. The ).S Const.uition 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 to states is known as
apportionmen (or reapportionment). Each state must receive at least 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, is affecting 2020 census field operations,
and this could have consequences 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-related changes and
proposals that may affect apportionment and redistricting following the 2020 census.


Census, Apportionment, and Redistricting Timing

Figure 1 provides a visual timeline of the typical census, apportionment, and redistricting processes
further described in this section. Federal statutc 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
prior to Apri 11. A count known as the a  orioniew p oJlu!tWop, which reflects the total resident
population in each state, is used to distribute House seats. The apportionment population includes minors
and noncitizens, in addition to Armed Forces and federal civilian personnel and their dependents living
abroad. WVltiln rune rnontlis offhc decenniai 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 they are officially presented to
the President.
Within the first week of the first regular session of the next Congress (typically, early January of a year
ending in 1), the President transmits a statemcnt to Congress that provides information on how to

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

CRS INSIGHT
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