Patients receiving care in mental hospitals, or psychiatric wards, or receiving mental health services in general hospitals or veteran's hospitals, or receiving care in alcoholic treatment and drug addiction centers. Basic records further discriminate among Federal, State, or local government and private mental hospitals.

Persons under care in nursing, convalescent, and rest homes for the aged and dependent (including county homes, almshouses, poor farms, and fraternal or religious homes for the aged). While the great majority of these inmates are older persons, persons who are economically dependent or who require nursing care because of chronic physical conditions may be found in these homes, regardless of age. Basic records differentiate homes known to have nursing care from homes not known to have nursing care, and further classify these homes into Federal and State, county and city, private nonprofit, and private proprietary.

Inmates of prisons, reformatories, local jails, and work houses. Basic records differentiate Federal, State, and local institutions. Correctional institutions are included with "Other institutions" in many tabulations.

Inmates of hospitals or wards for tuberculosis or other chronic disease (except mental); homes, schools, hospitals, or wards for the mentally or physically handicapped, including places for the blind and deaf; orphanages and other homes for dependent and neglected children; residential treatment centers for emotionally disturbed children; training schools for juvenile delinquents; and homes for unwed mothers. Basic records classify each type separately and in many cases differentiate public from private institutions.

Military personnel living in barracks or on ships. Residents of housing units on military bases are not counted here, but are included with the population in households.

College students in dormitories, and sorority houses) and rooming houses exclusively for college students (provided there are 10 or more unrelated students or 9 or more unrelated to the resident who operates the place).

Residents of rooming houses or other living quarters with 10 or more unrelated persons or nine or more persons not related to the person in charge, and the small number of persons temporarily residing in hotels, motels, Y's, and residential clubs who had no permanent residence elsewhere.

Persons in religious group quarters (e.g., convents, monasteries, and rectories); halfway houses; communes, transient quarters, including flophouses and missions; general hospital or nurses' dormitories. Also included are crews of commercial ships, institutional staff residing in group quarters, and persons enumerated in the casual count (nonhousehold living situations such as parks, campsites, transient sites, etc.). Basic records code each type separately. Public-use microdata samples identify the eight broad categories shown above, while internal basic records show over 70 detailed types.