Historically, homelessness emerged as a national issue in the 1870s.[6] Early homeless people lived in emerging urban cities, such as New York City. Into the 20th century, the Great Depression of the 1930s caused a substantial rise in homelessness. In 1990, the U.S. Census Bureau estimated the homeless population of to be 228,621, or 0.09% of the 248,709,873 enumerated in the 1990 U.S. census, which homelessness advocates criticized as an undercount.[7][8][9] In the 21st century, the Great Recession of the late 2000s and the resulting economic stagnation and downturn have been major driving factors and contributors to rising homelessness rates.
The main contributor to homelessness is a lack of housing supply and rising home values.[4][10][11] Interpersonal and individual factors, such as mental illness and addiction, also play a role in explaining homelessness.[10][11] However, mental illness and addiction play a weaker role than structural socio-economic factors, as West Coast cities such as Seattle, Portland, San Francisco, and Los Angeles have homelessness rates five times that of areas with much lower housing costs like Arkansas, West Virginia, and Detroit, even though the latter locations have high burdens of opioid addiction and poverty.[11][12]
Health complications are significant concern for homeless people, as lack of residence inhibits hygiene and access to healthy food,[13][14] and exposes individuals to both cold and heat stress. This contributes to increased mortality rates.[15]
Most homeless people lived in California, New York, Florida, and Washington in 2022, according to the annual Homeless Assessment Report.[16] Increases in homelessness broke records in 2022 and in 2023.[17][18][19] In 2023, record levels of homelessness have been declared in Los Angeles and New York City, and other cities around the country have reported increased levels of homelessness, with the main drivers being a shortage of affordable housing and the increased cost of living.[5][19]
^"U.S. Homelessness Up 11% This Year, a Record Increase". The Wall Street Journal. August 14, 2023. Retrieved September 15, 2023. Data reviewed by the Wall Street Journal shows homelessness is up about 11% from 2022. It's by far the biggest recorded increase since the government started tracking comparable numbers in 2007. The most significant driver remains high housing costs, as well as a lack of affordable rental units.
^ abThornton, Claire (December 15, 2023). "The number of homeless people in America grew in 2023 as high cost of living took a toll". USA Today. Retrieved January 7, 2024. Tens of thousands more people in the U.S. were homeless in 2023 compared with 2022 as high costs of living pushed some of the most vulnerable Americans into shelters and the streets. Homelessness shot up by more than 12% this year, reaching 653,104 people.