This study examines the characteristics and needs of Michigan's migrant and seasonal farmworkers. The study was based on census data, state agency records, and a statewide survey of service providers. Results indicate that neither mechanization nor other structural changes in Michigan's agricultural economy have diminished the industry's dependence on seasonal labor, which contributes significantly to the $15.5 billion generated annually by Michigan agriculture. In addition, the short-term influx of migrant workers has resulted in increased local spending and the creation of employment opportunities for service workers in programs developed for this population. Michigan's migrant farm labor force currently includes between 40,000 and 48,000 workers and their families, most of Mexican origin. The average workers' salary of $4.35 per hour (1987) has required the creation of a reliable system of social supports including child care, job training, legal services, and health care. Fifty-three of the 84 surveyed service providers provide services specifically for migrant and seasonal farmworkers. According to these service providers, the four major problem areas for migrant farmworkers and their families are housing, health, education, and employment. In addition, service providers cited several problems hindering their ability to deliver services, including inaccessibility of services, lack of funding, language and cultural differences, shortages of staff, and insensitivity of providers to farmworkers and their needs. Service providers' recommendations for improving service delivery to migrant and seasonal farmworkers are outlined. Contains 100 references, data tables, figures, and the survey questionnaire. (LP)