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How Many People Experience Homelessness?


Updated February 16, 2018


Attempts by the federal government to estimate the number
of people who are homeless have only taken place on a
regular basis for a little more than a decade. Prior to that,
there had been several national estimates of homelessness
but nothing both comprehensive and recurring.
The Department of Housing and Urban Development
(HUD)  is responsible for collecting and reporting data
about the scale of homelessness. Congress initiated HUD's
data collection efforts with a funding set-aside in the
department's FY1999 appropriations bill, to be used to
collect homelessness data. (See P.L. 105-276, which
references House Appropriations Committee Report
H.Rept. 105-610).
HUD  implemented  data collection through local
Continuums of Care (CoCs), the cities, counties, or
combinations of both that are the recipients of HUD's
Homeless Assistance Grants. CoCs are expected to collect
data and report to HUD. Since the mid-2000s, CoCs have
regularly submitted data to HUD, which, in turn, releases
information as part of Annual Homeless Assessment
Reports (AHARs). HUD   has released an AHAR each year
from 2005 through 2017. (AHARs are available on HUD's
website at https://www.hudexchange.info/hdx/guides/ahar/)
HUD Data Sources
HUD  reports two different estimates of homelessness in the
AHARs:  point-in-time counts from one day during the year
and full-year estimates based on a sample of jurisdictions.
The two data sources have strengths and weaknesses,
discussed below. This In Focus notes when and why one
source or the other is used to present data.

Point-in-Time  (PIT) Counts
HUD  requires communities receiving funds through the
Homeless Assistance Grants to conduct annual PIT counts
of people experiencing homelessness.
*  Time  Period: The counts are to occur on one day
   during the last week of January. Therefore, the counts
   are a snapshot of the number of people who are
   homeless on a given day. They are not meant to
   represent the total number of people who experience
   homelessness over the course of a year. PIT count
   results were first released for 2005.
*  Living Situation: The counts are meant to capture all
   persons experiencing homelessness including those
   living in shelters, transitional housing, the streets, and
   other places not meant for human habitation.
*  Method:  The PIT count is meant to capture all people
   experiencing homelessness and is not an estimate based on
   a sample (though local CoCs may use samples to arrive at
   their totals). HUD aggregates all data received from CoCs.
Full-Year Estimates
Data for the full-year estimates of persons experiencing
homelessness come from local Homeless Management


Information Systems (HMIS). Through HMIS, local
jurisdictions collect information about homeless individuals
they serve, and this is aggregated in information systems at
the community or state level.
*  Time  Period: The HMIS estimates differ from PIT
   counts in that they are based on a full year's worth of
   information (rather than one day). The estimates are also
   based on the federal fiscal year, from October 1 through
   September 30. Full-year estimates were first released for
   FY2007  (FY2005  and FY2006 estimates used three and
   six months of data, respectively).
*  Living Situation: The HMIS estimates only include
   individuals who are sheltered-residing in emergency
   shelters or transitional housing during the relevant time
   periods. Estimates do not include persons living on the
   street or in other places not meant for human
   habitation.
*  Method:  The estimates are based on a sample of
   communities rather than an aggregation of all
   communities. As a result, the estimates include
   confidence intervals available as part of the AHARs and
   supporting documents.
Both PIT count and HMIS full-year estimates are published
in HUD's AHARs.   See Table 1 for results from 2008 to
2017, though HMIS  data are not yet available for 2017.

Table  I. People Experiencing Homelessness
                    HMIS  Full-Year    Point-in-
        Year           Estimate       Time Count


2008
2009
2010
2011
2012
2013
2014
201 5
2016
2017


1,593,794
1,558,917
1,593,150
1,502,196
1,488,371
1,422,360
1,488,465
1,484,576
1,421,196


639,784
630,227
637,077
623,788
621,553
590,364
576,450
564,708
549,928
553,742


Source: HUD's Annual Homeless Assessment Reports,
https://www.hudexchange.info/hdx/guides/ahar/. Data from the 2007
to 2014 AHARs were revised in the 2015 AHAR, so numbers may be
different from what was reported in previous years.

Demographic Data
Adults  and Children
According to both PIT counts and HMIS estimates, the
majority of homeless people are individual adults (i.e.,


https://crsreports.congress go

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