From 1 July 1978 to 30 June 1982, the Tucson Nurse-Midwifery Service registered approximately 1000 clients for obstetrical care. Of these, 838 were followed to delivery by the nurse-midwives. This paper presents an overview of the Service, and the statistics related to these 838 clients, including a description of the age, parity, and extent of prenatal care of these clients; a review of the antepartal tests, complications, and admissions; a discussion of the nurse-midwifery management of labor, complications of labor, and transfers in labor; a summary of the modes of delivery; an enumeration of postpartum complications for all modes of delivery; and a report of the neonatal outcomes in terms of birth weights, Apgar scores, incidence of complications and numbers of deaths.