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Congressional Research Service
informing the legislative debate since 1914


Updated February 13, 2025


The Decennial Census of Population and Housing: An Overview


Every decade in the year ending with 0, the U.S. Census
Bureau conducts the decennial census of population and
housing. The decennial census is mandated by Article I,
Section 2 of the U.S. Constitution, in order to determine
each state's apportionment of seats in the House of
Representatives. Under current law, the Census Bureau
must inform Congress of the general subjects to be
addressed three years prior to the decennial census, and of
the actual questions to be asked two years prior to the
decennial census (13 U.S.C. §141).
Data from the decennial census are used for many purposes,
including to inform various policy decisions, guide federal
funding, offer the public insights on population trends, and
help the private sector make informed business decisions.
Due to the significance of the decennial census for
apportionment in particular, Congress has historically
shown interest in and provided oversight of the decennial
census. This In Focus provides an overview of some of the
issues involved in the decennial census, including funding,
data collection, and testing. It concludes with a discussion
of oversight opportunities for Congress.

2030   Decenna Census
The Census Bureau begins planning for an upcoming
decennial census more than a decade prior to the census
year. The Census Bureau has begun executing its planning
timeline for the 2030 census provided in Figure 2.
In 2023, the Census Bureau established the 2030 Census
Advisory Committee  (CAC) to review and provide
feedback related to 2030 census plans. Members of the
CAC  represent various stakeholder groups or interests. The
Census Bureau has utilized similar advisory committees in
the past. Other aspects of plans for the 2030 decennial
census, including field testing and technological
innovations, are discussed throughout this In Focus.

Bud  get  Trends
During each decade, annual funding levels for the Census
Bureau have generally increased as the decennial April 1
Figure 2. 2030 Census  Planning Timeline


census day draws near. Figure 1 shows this general
increase in Census Bureau appropriations adjusted for
inflation throughout the decades leading up to the 2000,
2010, and 2020 censuses; and Census Bureau
appropriations leading up to the 2030 decennial census so
far.

Figure I. U.S. Census Bureau  Funding  FY1991 -FY2024
Adjusted for inflation

















Source: Office of Management and Budget, Analytical/Perspectives:
Budget ofthe U.S. Government Fiscal Years 1998-2025.
Notes: All values adjusted to constant dollars using the CPI Inflation
Calculator from the base year in October to October 2024. Bar
colors are arranged by decennial census cycle.

  ta   Collection
The primary methods for the Census Bureau to collect data
from households are through self-response to a survey via
the internet, through mail via a paper form, or by phone. To
support data collection, the Census Bureau maintains a
Master Address File (MAF), which is intended to contain
an updated inventory of all known living quarters in the
United States and Puerto Rico.


                                                          DEVELOPMENT AND     PEAK PRODUCTION
                  EARLY PLANNING PHASE DESIGN SELECTION PHASE  INTEGRATION PHASE  AND CLOSE-OUT PHASE
                      2019-2021                              2025-2029          2029-2033









Source: U.S. Census Bureau, 2030 Census Planning Timeline.

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