According the the WSJ :

"After years of enforcing a tough anticamping law to break up homeless clusters, Sacramento recently formed a task force to look into designating homeless tracts because shelters are overflowing. One refuge in the California capital, St. John’s Shelter for Women and Children, is turning away about 350 people a night, compared with 25 two years ago, said executive director Michele Steeb."

New York has found a novel, if expensive, way of dealing with its overcrowded shelters – buying one-way tickets for homeless families to leave the city.