A survey of Wisconsin's migrant workers was conducted to obtain demographic information, to determine unmet health care needs, and to make recommendations for migrant health services based on those needs. A stratified random sample of 408 workers was selected, representing about 10% of the migrant workers in Wisconsin in the 1978 season; 262 of those selected were interviewed. Information was obtained by bilingual interviewers using a standard household interview form. Forty percent of those interviewed spoke only Spanish and 91 percent said that their ethnic heritage was Mexican. Migrants expressed the need for dental care, health facilities with night and weekend hours, Spanish-speaking health professionals, and improved environmental conditions. Unmet needs which were not perceived as important included mental health services, family planning, and alcoholism counseling. General recommendations, based on the findings of the survey, include upgrading the level of preventive health care, improving access to health care services, providing programs for improving mental health, enforcing existing environmental regulations, and involving migrants in the health planning process. The health survey form, printed in Spanish and English, is appended. (JH)