https://www.siliconvalley.com/2023/06/22/how-many-of-californias-homeless-residents-are-from-out-of-state/

Contrary to the oft-spouted belief that California’s temperate climate and supposedly generous social services make it a magnet for the country’s homeless people, a comprehensive new study finds the vast majority of the state’s unhoused residents lived here before losing their housing.

Why, then, is California home to almost a third of the nation’s homeless population? The main answer is simple, the University of California San Francisco study authors say: a severe shortage of affordable housing.