California, the largest employer of seasonal labor in the United States, provides low-cost housing for migrant farmworkers in 15 counties during the harvest season from April through November. In 1987, the 21st year of data collection, 27 housing centers with 2,071 housing units served 2,461 families containing 12,174 individuals. About 53% of total families stayed at the centers for the entire 180-day occupancy period. The typical migrant family consisted of two parents aged 18-44, with four to six years of education, two or three children, and possibly a grandmother or other relative; two members of the household worked in the fields, and two children attended day or infant care facilities at the center, or summer school off-site. Families' identified home bases were Mexico (34%), Texas (31%), California (20%), Arizona (10%), and the United States (1%). The home base of 4% of families was unknown. Most families migrated for the harvest season, worked five months, and returned directly to their home base to enroll children in school for the fall semester. This report contains four tables based on approved rental applications and monthly occupancy summaries, a map showing the distribution of housing centers, and a list of centers with addresses, unit rental information, and operating schedules. (SV)