PURPOSE:This study aims to examine the impact of a parental notification (PN) requirement on the frequency, timing, and out-of-state travel of minors seeking abortion, as well as changes in who minors involve in their decision, support received, and decision certainty. METHODS:We analyzed administrative and medical records of 1,577 women obtaining an abortion before and after implementation of a PN requirement at one Illinois facility. Using multivariate regression within a difference-in-differences framework, we quantified changes in the number and timing of women seeking care, frequency of parental awareness and support, travel from out-of-state, decision certainty, and anticipated coping among minors 17 years and below compared with young adults (YAs) aged 18-20 years. RESULTS:A smaller proportion of abortions to women ages 20 years and under post-law were among minors (39%-33%, p = .017). Compared with YAs, minors experienced a larger increase in parental awareness (71%-93% [minors] vs. 53%-58% [YAs], p < .000]; however, parents' support for the decision was unchanged. The proportion of minors certain of their decision went from 77% pre-law to 71% post-law (p = .099) compared with 82% pre- and post-law among YAs (p = .798). Compared with YAs, a larger proportion of minors obtained second trimester care post-law if coming from another state (21%-31% [minors] vs. 23%-16% [YAs], p = .022). CONCLUSIONS:Illinois' PN requirement was associated with a decrease in the number of abortions among minors, delayed care for those from out-of-state, increased parental awareness of the pregnancy, and no change in parents' support.