What causes homelessness
The headline answer most people give — addiction, mental illness, personal failure — is third or fourth on the list. The dominant variable is the housing market itself. Start here to see why.
Start pathway 1Learn about homelessness.
Four pathways from the headline framing to the underlying evidence. Read one. Read all four. The recommended sequence builds an argument; each pathway also works on its own.
How this works
Learn at a depth that builds as you read.
Each pathway opens with a plain-language reframing of what most people get wrong. As you scroll, it gets denser — evidence, data, sources. Inline links jump you sideways into deeper material on related concepts. Start anywhere. The sequence below is the order we recommend.
Who experiences homelessness
The mental image — a chronically homeless single adult on a sidewalk — is roughly a quarter of the population in any given year. The rest are families, kids, workers, veterans, and people you don't see.
Start pathway 2What actually ends it
We have decades of evidence on what works (housing, immediately, without preconditions) and what doesn't (sweeps, criminalization, treatment-first). The gap is funding scale and political will, not knowledge.
Start pathway 3A society where everyone has a home
Ending homelessness at scale is a policy question. Other countries have done it. Some US communities have done it for specific groups. The map from here to there is real, and you have a role in it.
Start pathway 4
Featured · published May 2026
Framework documents: four pieces, one argument.
The full evidence framework for what causes homelessness, what ends it, what it costs, and what a community that took the evidence seriously would do differently. Each piece stands alone; together they form a complete framework. For funders, federal staff, CoC leadership, elected officials, journalists, and the engaged public.
01 · Framework · 45 min
Ending Homelessness in America: A Core Framework
The anchor document. What homelessness is, why it persists, and what a community that took the evidence seriously would do differently.
02 · Funder guide · 35 min
Evidence-Based Allocation in Homelessness Philanthropy
Current philanthropic allocation is largely evidence-blind. What better allocation looks like — with the same dollars.
03 · Diagnostic · 25 min
Community Diagnostic: Assessing Your Homelessness System
A practical bottleneck-identification framework for CoC leadership and state agencies. Six failure patterns, benchmarks, and a 25-question checklist.
04 · Explainer · 30 min
What It Actually Costs to House Someone — and Not To
"Too expensive" is the wrong frame. The math on housing vs. the documented cost of leaving someone unhoused. For elected officials, journalists, and the public.
A note on this section
Who this is for
This is for everyone — the curious citizen, the donor deciding where to give, the journalist writing a story, the case manager who wants the data behind the daily work, the student researching for a class, the policymaker who needs to make a case. The pathway tiers serve all of those: top is overview, middle is evidence, bottom is sources. Read as deep as your time allows.
Programs & systems
The programs people navigate every day.
These are the programs, designations, and data systems that make up the homelessness response system. Understanding what each one does — and who controls it — is the foundation for understanding why the system works the way it does.
Continuum of Care
A federally-designated regional planning body that coordinates homelessness services and applies for HUD funding. Every community with HUD homeless funding has a CoC, and the CoC sets local priorities for who gets served first and how money is allocated.
Learn moreEmergency Solutions Grants
A HUD grant program that funds street outreach, emergency shelter operations, rapid re-housing, and homelessness prevention. ESG flows through states and some cities to local service providers, and is often the primary funder of emergency shelter.
Learn morePermanent Supportive Housing
Long-term subsidized housing paired with voluntary services for people with serious disabilities — including chronic homelessness, mental illness, and substance use disorders. PSH has the strongest evidence base of any housing intervention for the highest-need population.
Learn moreRapid Re-Housing
A short-to-medium term rental assistance and services intervention that moves people out of homelessness and into housing quickly, without requiring treatment compliance or sobriety. RRH works best for people with relatively recent housing histories and moderate barriers.
Learn moreCoordinated Entry System
A community-wide process for assessing people experiencing homelessness and matching them to the most appropriate available resource. CES is meant to replace the older first-come/first-served model with a prioritization system based on need and vulnerability.
Learn moreHomeless Management Information System
A shared database used across a CoC to track individual-level data on people experiencing homelessness and the services they receive. HMIS is how communities understand their system's performance and report to HUD — but participation is uneven and data quality varies widely.
Learn moreSSI/SSDI Outreach, Access, and Recovery
A training and technical assistance program that helps people experiencing homelessness apply for Social Security disability benefits. SOAR-trained workers dramatically improve approval rates and speed for this population, which can be a pathway to stable income and housing.
Learn moreHUD-VA Supportive Housing
A joint program between HUD and the VA that provides Housing Choice Vouchers specifically for homeless veterans, paired with VA case management and clinical services. HUD-VASH has been central to near-eliminating veteran homelessness in some communities.
Learn moreProjects for Assistance in Transition from Homelessness
A SAMHSA-funded program that provides outreach, case management, and mental health services for people experiencing homelessness who have serious mental illness. PATH workers meet people where they are and connect them to both services and housing resources.
Learn moreRunaway and Homeless Youth
A set of federal programs funded through the Family and Youth Services Bureau (FYSB) that specifically serve young people who are homeless or at risk. RHY programs include street outreach, short-term residential, and transitional living specifically designed for youth under 25.
Learn moreEmergency Housing Vouchers
Housing Choice Vouchers created by the American Rescue Plan Act (2021) specifically targeted to people who are homeless, at risk, fleeing domestic violence, or recently released from institutions. EHVs added 70,000 units of targeted rental assistance to the federal toolkit.
Learn moreFamily Unification Program
A HUD voucher program that provides rental assistance to families for whom inadequate housing is a primary reason their children are in or at risk of entering foster care. FUP also serves youth aging out of foster care, one of the highest-risk groups for homelessness.
Learn more
Follow the money
Where homelessness services funding comes from.
Most homelessness funding originates at the federal level, passes through multiple government layers, and reaches providers with significant strings attached. Understanding who controls each dollar explains a lot about why local systems work the way they do.
Federal
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State
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Local / CoC
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Provider
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Client
HUD CoC NOFO
Pays for permanent supportive housing, rapid re-housing, transitional housing, and coordinated entry operations. Controlled by HUD nationally; CoCs compete annually in the Notice of Funding Opportunity process. Awards range from hundreds of thousands to tens of millions per community.
Emergency Solutions Grants (ESG)
Funds emergency shelter, street outreach, rapid re-housing, and homelessness prevention. Controlled by HUD — allocated by formula to states and large cities, who re-grant to local nonprofits. Typical local allocation: $500K–$5M depending on community size.
Community Development Block Grant (CDBG)
Flexible federal block grant that can fund a range of low-income housing and community development activities, including homelessness prevention. Controlled by HUD via states and entitlement communities. Many cities use a portion for affordable housing or shelter infrastructure.
HOME Investment Partnerships
Funds affordable housing construction, rehabilitation, and tenant-based rental assistance. Controlled by HUD — granted to state and local governments. HOME is a major source of development financing for permanent supportive housing and affordable rental units.
Medicaid / HCBS Waivers
Funds health care and home- and community-based services for people with disabilities, including many people experiencing chronic homelessness. Controlled by states within federal rules — states that expand Medicaid and invest in HCBS can use it to fund supportive housing services.
SAMHSA PATH
Funds outreach, case management, and mental health services for homeless people with serious mental illness. Controlled by SAMHSA federally; granted to states who allocate to local providers. Amounts are relatively modest but fill a critical outreach gap.
VA SSVF (Supportive Services for Veteran Families)
Funds rapid re-housing and homelessness prevention for very low-income veteran families. Controlled by the VA — granted directly to community providers through a competitive process. SSVF is a major driver of reductions in veteran homelessness.
State Housing Trust Funds
State-level dedicated funding streams for affordable housing, often used for development subsidies, rental assistance, or emergency housing programs. Controlled by state housing agencies — amounts and uses vary widely by state. Some states have robust trust funds; many do not.
Low-Income Housing Tax Credit (LIHTC)
The primary federal tool for financing affordable rental housing development — tax credits sold to investors generate equity for affordable projects. Controlled by state housing finance agencies, which set local priorities. Most permanent supportive housing is built with LIHTC equity plus operating subsidies.
Philanthropy
Private foundation and donor funding that pays for innovation, navigation, and gaps federal programs don't cover. Controlled by funders — often more flexible than government dollars but unreliable and frequently short-term. Critical for piloting new approaches before they can attract public funding.
What's working
Communities that moved the needle — and what made it possible.
A handful of communities have achieved measurable, large-scale reductions in homelessness. The ones that succeeded share common factors. So do the ones that regressed. Both are worth studying.
Houston, TX
Result: 63% reduction in homelessness since 2011 — one of the largest documented reductions of any major US city.
Houston's success is credited to a unified CoC that includes all major funders and providers, a strong housing-first orientation, aggressive use of HUD-VASH and ESG, and a political environment where reducing visible homelessness became a cross-partisan priority. The key was organizational alignment — every funder, provider, and government agency working from the same data toward the same goals.
Bergen County, NJ
Result: Achieved and sustained functional zero for both chronic and veteran homelessness — one of the few urban counties to do so.
Bergen County used Built for Zero methodology: real-time by-name tracking of every person experiencing homelessness, monthly case conferencing to match individuals to housing, and a commitment to treating the population as finite and solvable. The by-name list discipline — knowing every person, not just aggregate counts — was essential to closing the gap.
Built for Zero / Community Solutions
Result: Over 100 US communities enrolled; more than 30 have reached functional zero for veterans or chronic homelessness as of 2024.
Built for Zero is a national initiative that reframes homelessness as a solvable systems problem. The core discipline: maintain a real-time by-name list, measure monthly, and use quality improvement cycles to close gaps between inflow and housing placements. Communities that reach functional zero typically have strong CoC leadership, political buy-in, and a culture of shared accountability across providers.
Salt Lake City, UT
Result: Early PSH success in the 2000s; significant regression since 2015 as affordable housing costs increased and the shelter system was restructured.
Utah was widely cited as a Housing First success story through the early 2010s, achieving a near-90% reduction in chronic homelessness between 2005–2015. That progress has substantially reversed as housing costs rose, state-level political support shifted, and the shelter system underwent disruptive changes. Salt Lake City is a cautionary example: gains made through PSH investment can erode quickly when housing costs outpace subsidy levels and systems aren't maintained.
Finland (national)
Result: Reduced homelessness by roughly 75% over 30 years; long-term homelessness is now rare enough to be individually trackable.
Finland's national Housing First strategy, launched in 2008, converted emergency shelters into permanent housing with onsite support services, built new subsidized units, and aligned national and municipal government around the approach. The program is state-funded and government-managed — not dependent on nonprofit fundraising cycles. Finland demonstrates that large-scale reduction is achievable with sufficient political will and housing supply investment, but requires sustained public funding at scale.
Rockford, IL
Result: First community in the US to reach functional zero for veteran homelessness (2015), followed by chronic homelessness (2021).
Rockford achieved functional zero through Built for Zero methodology with exceptionally strong local implementation: a CoC that uses a true by-name registry, a housing coordinator who actively manages every open case, and a cross-sector coalition that kept political and funder support stable across multiple years. Rockford's size (mid-sized metro, ~150K population) meant the by-name system was tractable — a lesson for similarly-sized communities that functional zero is achievable outside major metros.
Evidence base
What the research actually says.
Ending Homelessness Knowledge Base
23 evidence findings catalogued across prevention, rehousing, system performance, and root causes. Publishing to Common Ladder in stages.
Browse the evidence base
The data
National homeless population trend, 2015–2024.
HUD's Point-in-Time (PIT) count is an annual single-night census of people experiencing homelessness. It undercounts unsheltered homelessness but is the most consistent longitudinal dataset available.
Chart 1: National Total (2015–2024)
The national PIT count showed relative stability from 2015–2017 (~550K), a gradual decline through 2020, an accelerating increase from 2020–2023, and a new peak of approximately 770,000 in 2024. The 2024 figure represents the highest recorded count in the modern data series.
Key data points: 2015: 565,000 · 2017: 554,000 · 2019: 568,000 · 2020: 580,000 · 2022: 582,000 · 2023: 653,000 · 2024: 770,000
Chart 2: Sheltered vs. Unsheltered (2015–2024)
Unsheltered homelessness has driven most of the increase since 2020. In 2015, roughly 60% of people counted were in emergency shelters or transitional housing; by 2024, unsheltered counts account for a significantly larger share of the total as shelter capacity has not kept pace with need.
The rise in unsheltered homelessness is concentrated in high-cost West Coast and Sun Belt metros, but is no longer confined to those regions. The 2024 data reflects the sharpest single-year increase in the modern series.
Chart insight: The 2024 count of approximately 770,000 is the highest recorded figure in the modern HUD PIT data series, reflecting the compounding effects of housing cost increases, shelter capacity gaps, and the expiration of pandemic-era housing protections.
Get into this work
Pathways into the homelessness services workforce.
Homelessness services is a real workforce with defined roles, career tracks, and training programs. If you want to do this work professionally, here is what the on-ramps actually look like.
Outreach Worker
Credentials: No degree typically required; some employers prefer social services or human services certificate.
Training: Motivational interviewing, harm reduction fundamentals, trauma-informed care basics. Many community colleges offer relevant certificates.
Entry: Most positions are entry-level. Often the first role people take. High demand, difficult work, historically low pay — but growing attention to workforce investment is improving wages in some CoCs.
Housing Case Manager
Credentials: Bachelor's in social work, psychology, or related field typical; some positions accept associates + experience.
Training: Housing stability coaching, landlord-tenant law basics, benefits navigation, crisis de-escalation.
Entry: Core role in RRH and PSH programs. Many providers hire from their own outreach or shelter staff. NASW membership and eventual LCSW licensure opens senior clinical paths.
CoC System Administrator
Credentials: Bachelor's required; master's (public administration, social work, urban planning) strongly preferred for leadership roles.
Training: HUD CoC regulations, NOFO compliance, Coordinated Entry design, community planning facilitation.
Entry: CoC staff positions are typically housed at lead agencies or government offices. Often reached after 3–5 years in direct service or program management. NAEH conference training and HUD TA resources are key professional development channels.
HMIS Analyst
Credentials: Bachelor's preferred; data/analytics background more important than social services degree for this role.
Training: HMIS data standards (HUD HDX, LSA), SQL or equivalent query tools, HUD system performance measures.
Entry: High demand and underserved in most CoCs. Strong data skills transfer well from other fields. HMIS vendor certifications (Clarity, Bitfocus, ServicePoint) are practical credentials. This role has significant influence over how communities understand their own systems.
Housing Locator
Credentials: No degree typically required; real estate or property management background helpful.
Training: Landlord engagement skills, Fair Housing law basics, housing subsidy types and requirements, negotiation.
Entry: Specialized role focused on recruiting landlords to accept housing vouchers and place clients. Growing recognition of this role's importance has led more CoCs to fund dedicated positions. Relationship-building and persistence are the core competencies.
Peer Support Specialist
Credentials: Lived experience of homelessness, mental illness, or substance use disorder required; state peer specialist certification available in most states.
Training: State peer support certification program (typically 40–80 hours); Mental Health First Aid, Wellness Recovery Action Plan (WRAP).
Entry: Explicitly valued for lived experience. Peer roles exist in outreach, shelter, PSH, and behavioral health settings. Certification opens doors and ensures wage parity in many programs. One of the fastest-growing roles in homelessness services.
Harm Reduction Worker
Credentials: No degree typically required; lived experience often valued.
Training: Naloxone administration, safer use education, motivational interviewing, trauma-informed care. Harm Reduction Coalition and SAMHSA offer training resources.
Entry: Positions exist in needle exchanges, street medicine programs, and outreach teams embedded in homelessness services. Work often intersects with overdose response and infectious disease prevention. High-impact, high-stress, undercompensated — but essential.
SOAR-Trained Benefits Specialist
Credentials: No degree required; SOAR online training (free, ~8 hours) is the core credential.
Training: SOAR Online Learning Series (samhsa.gov), SSA disability policy, medical documentation gathering.
Entry: SOAR certification is embedded in many case management and outreach roles rather than a standalone position. Acquiring SOAR certification makes any direct service worker significantly more effective. Relatively quick to train and immediately applicable in the field.
Supportive Housing Property Manager
Credentials: Property management experience and/or certification (NALP, CAM) helpful; experience working with special populations increasingly valued.
Training: Trauma-informed property management, Fair Housing compliance, working with tenants with disabilities, eviction prevention practices.
Entry: PSH properties need property managers who understand both housing operations and the populations they serve. Traditional property management background transfers; supplemented with social services orientation. Growing nonprofit housing developer sector creates demand for this hybrid role.
Start serving
I want to help. Where do I start?
Most people who want to help land on the wrong thing first — because it's visible, not because it works. Here is what actually helps, by who you are.
Individuals
What NOT to do: Don't hand out cash on the street as your primary action — it does not address the structural causes and can feel sufficient when it isn't.
What actually helps: Volunteer with your local CoC's coordinated entry or outreach program — this is where individual time has the highest leverage. Donate to organizations that provide rapid re-housing or permanent supportive housing, not just meal programs. Advocate to your city council for shelter capacity, zoning reform, and housing investment — political pressure from constituents is the actual pressure point.
Faith Communities
What NOT to do: Don't run an unsanctioned overnight shelter without connecting to the formal system — it bypasses coordinated entry and can create dependencies without pathways.
What actually helps: Partner with your local CoC to host sanctioned shelter capacity, storage, or day services that integrate with the coordinated entry system. Faith communities are often ideal landlords for supportive housing — stable, mission-aligned, and holding real estate. Use your community's political and organizational credibility to advocate publicly for housing solutions.
Employers
What NOT to do: Don't design a "homeless hiring program" as a PR initiative without systems to actually support retention.
What actually helps: Partner with transitional jobs programs and supportive housing providers who can provide wraparound support to new employees. Offer flexible scheduling and advance pay options — financial shock absorbers that matter enormously for people with thin margins. Join your local CoC's business advisory council or housing task force where employer credibility carries real influence.
Landlords
What NOT to do: Don't decline housing vouchers reflexively — the data on tenant performance with PSH or RRH support is strong, and declining vouchers reduces housing access for the highest-need people.
What actually helps: Accept Housing Choice Vouchers, HUD-VASH, or RRH subsidies — and ask your local CoC about landlord incentive programs (damage deposits, vacancy loss protection, and a dedicated housing locator who handles problems). Many communities have formal landlord partnership programs that reduce your risk substantially. Contact your local CoC's housing locator to learn what's available.
Neighborhood Groups
What NOT to do: Don't oppose shelter, supportive housing, or transitional housing in your neighborhood — NIMBY opposition is one of the primary mechanisms by which housing solutions get blocked, and the research on neighborhood impact is consistently reassuring.
What actually helps: Attend CoC planning meetings and city council hearings to support housing and shelter proposals. If a supportive housing development is proposed near you, engage constructively with the provider rather than opposing it — most providers welcome community relationship-building. Advocate for zoning reform that allows more housing types in your neighborhood.
Want to act on what you learn?
If you need help yourself, start with the resource finder. If you want to understand your local system or contribute, the resources page has every tool we publish.
Find resources near me