
Background: Data from the Medan District Health Office in 2015, that the coverage of assistance during delivery by medical staff was 82.38%, postpartum health services was 80.80%, a woman postnatal received vitamin A was 80.80%. Objective: to find out the determinants of utilization of postpartum health services. Methods: The research was an quantitative research with explanatory survey design with cross sectional approach. It was conducted in the working area of Medan Belawan Public Health Center, Medan Belawan Subdistrict. The study population was all mothers who passed the postpartum period and had biological children aged 6-9 years who resided in the working area of Medan Belawan Public Health Center in 2015 as many as 1,385 people. The study sample was a portion of a population as many as 102 people. Sampling using purposive sampling technique. Data analysis used univariate analysis, and bivariate analysis with chi-square test. Results: the determinants of utilization of postpartum health services in the working area of Medan Belawan Public Health Center, Medan Belawan Subdistrict, were knowledge (p=0.032), ownership of Mother and Child Health Books (p=0.026), information source (p=0.003), and maternal conditions (p=0.001). The variable maternal condition is the most contributing and most dominant variable in determining the utilization of postpartum health services which has an Exp (B) value of 26.89. Conclusion: It is recommended to the Medan City Health Office and medical workers to improve socialization about the use of postpartum health services, train and guide cadres in the utilization of postpartum health services for postpartum mothers, fill out and check and inform about maternal and child health books, and provide information about everything regarding utilization of postpartum health services and reminding mothers of the time of their next visit.