McKinney-Vento Homeless Assistance Act of the Title VII-B of the Every Student Succeeds Act 

The term "homeless children and youth" -

Means individuals who lack a fixed, regular, and adequate nighttime residence including; 

i. Children and youths who are sharing the housing of other persons due to loss of housing, economic hardship, or similar reason; are living in motels, hotels, trailer parks or camping grounds due to the lack of alternative accommodations; are living in emergency or transitional shelters; are abandoned in hospitals; or are awaiting foster care placement;

ii. Children and youths who have a primary nighttime residence that is a public or private place not designated for or ordinarily used as a regular sleeping accommodation for human beings...

iii. Children and youths who are living in cars, parks, public spaces, abandoned building, substandard housing, bus or train stations, or similar settings; and

iv. Migratory children who qualify as homeless for the purposes of this subtitle because the children are living in circumstances described in clauses (i) through (iii).