A comprehensive study of migrant and seasonal farmworkers in Texas was conducted to provide an accurate estimate of this farmworker population, to obtain data about their demographic characteristics, and to determine the extent of use of social service agencies, especially those delivering services under the Comprehensive Employment and Training Act. Names of 2,862 migrant and seasonal farmworker households were randomly selected from the participant rolls of social service agencies in 7 regions which were a recognized home base for migrants and had adequate outreach coverage. A standardized interview instrument was used for guidance in soliciting information from 1,609 interviewees. Interview data identified a group of migrant and seasonal farmworkers which provided an unbiased sample that was used to estimate the population. Respondents in this sample provided information which was used to calculate the percentage of migrant and seasonal farmworkers currently being "counted" (listed as participants of a social service agency) as compared to those who were "uncounted" (not listed as participants of any social service agency). A "counted to uncounted" ratio was developed and applied to all areas of the State, thus providing population estimates. Among the findings were that there were 85,600 migrant and seasonal farmworker households in Texas; 375,000 persons resided in migrant households and 120,000 in seasonal farmworker households; and 95% were of Mexican or Mexican American origin. (NQ)